mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-12-23 15:53:07 -05:00
725 lines
18 KiB
Go
725 lines
18 KiB
Go
// Copyright 2013 Martini Authors
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// Copyright 2014 The Macaron Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package macaron
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import (
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"bytes"
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"encoding/json"
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"encoding/xml"
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"fmt"
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"html/template"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"path"
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"path/filepath"
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"strings"
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"sync"
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"time"
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"github.com/Unknwon/com"
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)
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const (
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_CONTENT_TYPE = "Content-Type"
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_CONTENT_LENGTH = "Content-Length"
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_CONTENT_BINARY = "application/octet-stream"
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_CONTENT_JSON = "application/json"
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_CONTENT_HTML = "text/html"
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_CONTENT_PLAIN = "text/plain"
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_CONTENT_XHTML = "application/xhtml+xml"
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_CONTENT_XML = "text/xml"
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_DEFAULT_CHARSET = "UTF-8"
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)
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var (
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// Provides a temporary buffer to execute templates into and catch errors.
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bufpool = sync.Pool{
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New: func() interface{} { return new(bytes.Buffer) },
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}
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// Included helper functions for use when rendering html
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helperFuncs = template.FuncMap{
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"yield": func() (string, error) {
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return "", fmt.Errorf("yield called with no layout defined")
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},
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"current": func() (string, error) {
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return "", nil
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},
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}
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)
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type (
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// TemplateFile represents a interface of template file that has name and can be read.
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TemplateFile interface {
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Name() string
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Data() []byte
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Ext() string
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}
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// TemplateFileSystem represents a interface of template file system that able to list all files.
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TemplateFileSystem interface {
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ListFiles() []TemplateFile
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Get(string) (io.Reader, error)
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}
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// Delims represents a set of Left and Right delimiters for HTML template rendering
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Delims struct {
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// Left delimiter, defaults to {{
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Left string
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// Right delimiter, defaults to }}
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Right string
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}
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// RenderOptions represents a struct for specifying configuration options for the Render middleware.
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RenderOptions struct {
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// Directory to load templates. Default is "templates".
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Directory string
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// Addtional directories to overwite templates.
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AppendDirectories []string
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// Layout template name. Will not render a layout if "". Default is to "".
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Layout string
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// Extensions to parse template files from. Defaults are [".tmpl", ".html"].
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Extensions []string
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// Funcs is a slice of FuncMaps to apply to the template upon compilation. This is useful for helper functions. Default is [].
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Funcs []template.FuncMap
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// Delims sets the action delimiters to the specified strings in the Delims struct.
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Delims Delims
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// Appends the given charset to the Content-Type header. Default is "UTF-8".
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Charset string
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// Outputs human readable JSON.
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IndentJSON bool
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// Outputs human readable XML.
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IndentXML bool
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// Prefixes the JSON output with the given bytes.
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PrefixJSON []byte
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// Prefixes the XML output with the given bytes.
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PrefixXML []byte
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// Allows changing of output to XHTML instead of HTML. Default is "text/html"
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HTMLContentType string
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// TemplateFileSystem is the interface for supporting any implmentation of template file system.
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TemplateFileSystem
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}
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// HTMLOptions is a struct for overriding some rendering Options for specific HTML call
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HTMLOptions struct {
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// Layout template name. Overrides Options.Layout.
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Layout string
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}
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Render interface {
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http.ResponseWriter
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SetResponseWriter(http.ResponseWriter)
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JSON(int, interface{})
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JSONString(interface{}) (string, error)
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RawData(int, []byte) // Serve content as binary
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PlainText(int, []byte) // Serve content as plain text
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HTML(int, string, interface{}, ...HTMLOptions)
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HTMLSet(int, string, string, interface{}, ...HTMLOptions)
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HTMLSetString(string, string, interface{}, ...HTMLOptions) (string, error)
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HTMLString(string, interface{}, ...HTMLOptions) (string, error)
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HTMLSetBytes(string, string, interface{}, ...HTMLOptions) ([]byte, error)
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HTMLBytes(string, interface{}, ...HTMLOptions) ([]byte, error)
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XML(int, interface{})
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Error(int, ...string)
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Status(int)
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SetTemplatePath(string, string)
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HasTemplateSet(string) bool
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}
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)
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// TplFile implements TemplateFile interface.
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type TplFile struct {
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name string
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data []byte
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ext string
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}
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// NewTplFile cerates new template file with given name and data.
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func NewTplFile(name string, data []byte, ext string) *TplFile {
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return &TplFile{name, data, ext}
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}
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func (f *TplFile) Name() string {
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return f.name
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}
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func (f *TplFile) Data() []byte {
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return f.data
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}
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func (f *TplFile) Ext() string {
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return f.ext
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}
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// TplFileSystem implements TemplateFileSystem interface.
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type TplFileSystem struct {
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files []TemplateFile
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}
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// NewTemplateFileSystem creates new template file system with given options.
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func NewTemplateFileSystem(opt RenderOptions, omitData bool) TplFileSystem {
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fs := TplFileSystem{}
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fs.files = make([]TemplateFile, 0, 10)
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// Directories are composed in reverse order because later one overwrites previous ones,
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// so once found, we can directly jump out of the loop.
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dirs := make([]string, 0, len(opt.AppendDirectories)+1)
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for i := len(opt.AppendDirectories) - 1; i >= 0; i-- {
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dirs = append(dirs, opt.AppendDirectories[i])
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}
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dirs = append(dirs, opt.Directory)
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var err error
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for i := range dirs {
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// Skip ones that does not exists for symlink test,
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// but allow non-symlink ones added after start.
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if !com.IsExist(dirs[i]) {
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continue
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}
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dirs[i], err = filepath.EvalSymlinks(dirs[i])
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if err != nil {
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panic("EvalSymlinks(" + dirs[i] + "): " + err.Error())
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}
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}
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lastDir := dirs[len(dirs)-1]
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// We still walk the last (original) directory because it's non-sense we load templates not exist in original directory.
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if err = filepath.Walk(lastDir, func(path string, info os.FileInfo, err error) error {
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r, err := filepath.Rel(lastDir, path)
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if err != nil {
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return err
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}
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ext := GetExt(r)
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for _, extension := range opt.Extensions {
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if ext != extension {
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continue
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}
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var data []byte
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if !omitData {
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// Loop over candidates of directory, break out once found.
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// The file always exists because it's inside the walk function,
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// and read original file is the worst case.
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for i := range dirs {
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path = filepath.Join(dirs[i], r)
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if !com.IsFile(path) {
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continue
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}
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data, err = ioutil.ReadFile(path)
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if err != nil {
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return err
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}
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break
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}
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}
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name := filepath.ToSlash((r[0 : len(r)-len(ext)]))
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fs.files = append(fs.files, NewTplFile(name, data, ext))
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}
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return nil
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}); err != nil {
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panic("NewTemplateFileSystem: " + err.Error())
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}
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return fs
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}
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func (fs TplFileSystem) ListFiles() []TemplateFile {
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return fs.files
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}
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func (fs TplFileSystem) Get(name string) (io.Reader, error) {
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for i := range fs.files {
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if fs.files[i].Name()+fs.files[i].Ext() == name {
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return bytes.NewReader(fs.files[i].Data()), nil
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}
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}
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return nil, fmt.Errorf("file '%s' not found", name)
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}
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func PrepareCharset(charset string) string {
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if len(charset) != 0 {
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return "; charset=" + charset
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}
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return "; charset=" + _DEFAULT_CHARSET
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}
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func GetExt(s string) string {
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index := strings.Index(s, ".")
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if index == -1 {
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return ""
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}
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return s[index:]
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}
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func compile(opt RenderOptions) *template.Template {
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t := template.New(opt.Directory)
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t.Delims(opt.Delims.Left, opt.Delims.Right)
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// Parse an initial template in case we don't have any.
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template.Must(t.Parse("Macaron"))
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if opt.TemplateFileSystem == nil {
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opt.TemplateFileSystem = NewTemplateFileSystem(opt, false)
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}
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for _, f := range opt.TemplateFileSystem.ListFiles() {
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tmpl := t.New(f.Name())
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for _, funcs := range opt.Funcs {
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tmpl.Funcs(funcs)
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}
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// Bomb out if parse fails. We don't want any silent server starts.
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template.Must(tmpl.Funcs(helperFuncs).Parse(string(f.Data())))
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}
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return t
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}
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const (
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DEFAULT_TPL_SET_NAME = "DEFAULT"
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)
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// TemplateSet represents a template set of type *template.Template.
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type TemplateSet struct {
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lock sync.RWMutex
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sets map[string]*template.Template
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dirs map[string]string
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}
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// NewTemplateSet initializes a new empty template set.
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func NewTemplateSet() *TemplateSet {
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return &TemplateSet{
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sets: make(map[string]*template.Template),
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dirs: make(map[string]string),
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}
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}
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func (ts *TemplateSet) Set(name string, opt *RenderOptions) *template.Template {
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t := compile(*opt)
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ts.lock.Lock()
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defer ts.lock.Unlock()
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ts.sets[name] = t
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ts.dirs[name] = opt.Directory
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return t
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}
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func (ts *TemplateSet) Get(name string) *template.Template {
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ts.lock.RLock()
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defer ts.lock.RUnlock()
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return ts.sets[name]
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}
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func (ts *TemplateSet) GetDir(name string) string {
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ts.lock.RLock()
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defer ts.lock.RUnlock()
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return ts.dirs[name]
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}
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func prepareRenderOptions(options []RenderOptions) RenderOptions {
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var opt RenderOptions
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if len(options) > 0 {
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opt = options[0]
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}
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// Defaults.
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if len(opt.Directory) == 0 {
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opt.Directory = "templates"
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}
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if len(opt.Extensions) == 0 {
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opt.Extensions = []string{".tmpl", ".html"}
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}
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if len(opt.HTMLContentType) == 0 {
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opt.HTMLContentType = _CONTENT_HTML
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}
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return opt
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}
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func ParseTplSet(tplSet string) (tplName string, tplDir string) {
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tplSet = strings.TrimSpace(tplSet)
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if len(tplSet) == 0 {
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panic("empty template set argument")
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}
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infos := strings.Split(tplSet, ":")
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if len(infos) == 1 {
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tplDir = infos[0]
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tplName = path.Base(tplDir)
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} else {
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tplName = infos[0]
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tplDir = infos[1]
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}
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if !com.IsDir(tplDir) {
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panic("template set path does not exist or is not a directory")
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}
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return tplName, tplDir
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}
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func renderHandler(opt RenderOptions, tplSets []string) Handler {
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cs := PrepareCharset(opt.Charset)
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ts := NewTemplateSet()
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ts.Set(DEFAULT_TPL_SET_NAME, &opt)
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var tmpOpt RenderOptions
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for _, tplSet := range tplSets {
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tplName, tplDir := ParseTplSet(tplSet)
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tmpOpt = opt
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tmpOpt.Directory = tplDir
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ts.Set(tplName, &tmpOpt)
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}
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return func(ctx *Context) {
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r := &TplRender{
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ResponseWriter: ctx.Resp,
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TemplateSet: ts,
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Opt: &opt,
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CompiledCharset: cs,
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}
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ctx.Data["TmplLoadTimes"] = func() string {
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if r.startTime.IsZero() {
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return ""
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}
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return fmt.Sprint(time.Since(r.startTime).Nanoseconds()/1e6) + "ms"
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}
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ctx.Render = r
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ctx.MapTo(r, (*Render)(nil))
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}
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}
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// Renderer is a Middleware that maps a macaron.Render service into the Macaron handler chain.
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// An single variadic macaron.RenderOptions struct can be optionally provided to configure
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// HTML rendering. The default directory for templates is "templates" and the default
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// file extension is ".tmpl" and ".html".
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//
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// If MACARON_ENV is set to "" or "development" then templates will be recompiled on every request. For more performance, set the
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// MACARON_ENV environment variable to "production".
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func Renderer(options ...RenderOptions) Handler {
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return renderHandler(prepareRenderOptions(options), []string{})
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}
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func Renderers(options RenderOptions, tplSets ...string) Handler {
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return renderHandler(prepareRenderOptions([]RenderOptions{options}), tplSets)
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}
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type TplRender struct {
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http.ResponseWriter
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*TemplateSet
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Opt *RenderOptions
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CompiledCharset string
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startTime time.Time
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}
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func (r *TplRender) SetResponseWriter(rw http.ResponseWriter) {
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r.ResponseWriter = rw
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}
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func (r *TplRender) JSON(status int, v interface{}) {
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var (
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result []byte
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err error
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)
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if r.Opt.IndentJSON {
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result, err = json.MarshalIndent(v, "", " ")
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} else {
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result, err = json.Marshal(v)
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}
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if err != nil {
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http.Error(r, err.Error(), 500)
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return
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}
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// json rendered fine, write out the result
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r.Header().Set(_CONTENT_TYPE, _CONTENT_JSON+r.CompiledCharset)
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r.WriteHeader(status)
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if len(r.Opt.PrefixJSON) > 0 {
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r.Write(r.Opt.PrefixJSON)
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}
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r.Write(result)
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}
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func (r *TplRender) JSONString(v interface{}) (string, error) {
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var result []byte
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var err error
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if r.Opt.IndentJSON {
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result, err = json.MarshalIndent(v, "", " ")
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} else {
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result, err = json.Marshal(v)
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}
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if err != nil {
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return "", err
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}
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return string(result), nil
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}
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func (r *TplRender) XML(status int, v interface{}) {
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var result []byte
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var err error
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if r.Opt.IndentXML {
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result, err = xml.MarshalIndent(v, "", " ")
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} else {
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result, err = xml.Marshal(v)
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}
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if err != nil {
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http.Error(r, err.Error(), 500)
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return
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}
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// XML rendered fine, write out the result
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r.Header().Set(_CONTENT_TYPE, _CONTENT_XML+r.CompiledCharset)
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r.WriteHeader(status)
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if len(r.Opt.PrefixXML) > 0 {
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r.Write(r.Opt.PrefixXML)
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}
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r.Write(result)
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}
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func (r *TplRender) data(status int, contentType string, v []byte) {
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if r.Header().Get(_CONTENT_TYPE) == "" {
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r.Header().Set(_CONTENT_TYPE, contentType)
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}
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r.WriteHeader(status)
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r.Write(v)
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}
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func (r *TplRender) RawData(status int, v []byte) {
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r.data(status, _CONTENT_BINARY, v)
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}
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func (r *TplRender) PlainText(status int, v []byte) {
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r.data(status, _CONTENT_PLAIN, v)
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}
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func (r *TplRender) execute(t *template.Template, name string, data interface{}) (*bytes.Buffer, error) {
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buf := bufpool.Get().(*bytes.Buffer)
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return buf, t.ExecuteTemplate(buf, name, data)
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}
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func (r *TplRender) addYield(t *template.Template, tplName string, data interface{}) {
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funcs := template.FuncMap{
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"yield": func() (template.HTML, error) {
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buf, err := r.execute(t, tplName, data)
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// return safe html here since we are rendering our own template
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return template.HTML(buf.String()), err
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},
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"current": func() (string, error) {
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return tplName, nil
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},
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}
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t.Funcs(funcs)
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}
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func (r *TplRender) renderBytes(setName, tplName string, data interface{}, htmlOpt ...HTMLOptions) (*bytes.Buffer, error) {
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t := r.TemplateSet.Get(setName)
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if Env == DEV {
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opt := *r.Opt
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opt.Directory = r.TemplateSet.GetDir(setName)
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t = r.TemplateSet.Set(setName, &opt)
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}
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if t == nil {
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return nil, fmt.Errorf("html/template: template \"%s\" is undefined", tplName)
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}
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opt := r.prepareHTMLOptions(htmlOpt)
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if len(opt.Layout) > 0 {
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r.addYield(t, tplName, data)
|
|
tplName = opt.Layout
|
|
}
|
|
|
|
out, err := r.execute(t, tplName, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return out, nil
|
|
}
|
|
|
|
func (r *TplRender) renderHTML(status int, setName, tplName string, data interface{}, htmlOpt ...HTMLOptions) {
|
|
r.startTime = time.Now()
|
|
|
|
out, err := r.renderBytes(setName, tplName, data, htmlOpt...)
|
|
if err != nil {
|
|
http.Error(r, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
r.Header().Set(_CONTENT_TYPE, r.Opt.HTMLContentType+r.CompiledCharset)
|
|
r.WriteHeader(status)
|
|
|
|
if _, err := out.WriteTo(r); err != nil {
|
|
out.Reset()
|
|
}
|
|
bufpool.Put(out)
|
|
}
|
|
|
|
func (r *TplRender) HTML(status int, name string, data interface{}, htmlOpt ...HTMLOptions) {
|
|
r.renderHTML(status, DEFAULT_TPL_SET_NAME, name, data, htmlOpt...)
|
|
}
|
|
|
|
func (r *TplRender) HTMLSet(status int, setName, tplName string, data interface{}, htmlOpt ...HTMLOptions) {
|
|
r.renderHTML(status, setName, tplName, data, htmlOpt...)
|
|
}
|
|
|
|
func (r *TplRender) HTMLSetBytes(setName, tplName string, data interface{}, htmlOpt ...HTMLOptions) ([]byte, error) {
|
|
out, err := r.renderBytes(setName, tplName, data, htmlOpt...)
|
|
if err != nil {
|
|
return []byte(""), err
|
|
}
|
|
return out.Bytes(), nil
|
|
}
|
|
|
|
func (r *TplRender) HTMLBytes(name string, data interface{}, htmlOpt ...HTMLOptions) ([]byte, error) {
|
|
return r.HTMLSetBytes(DEFAULT_TPL_SET_NAME, name, data, htmlOpt...)
|
|
}
|
|
|
|
func (r *TplRender) HTMLSetString(setName, tplName string, data interface{}, htmlOpt ...HTMLOptions) (string, error) {
|
|
p, err := r.HTMLSetBytes(setName, tplName, data, htmlOpt...)
|
|
return string(p), err
|
|
}
|
|
|
|
func (r *TplRender) HTMLString(name string, data interface{}, htmlOpt ...HTMLOptions) (string, error) {
|
|
p, err := r.HTMLBytes(name, data, htmlOpt...)
|
|
return string(p), err
|
|
}
|
|
|
|
// Error writes the given HTTP status to the current ResponseWriter
|
|
func (r *TplRender) Error(status int, message ...string) {
|
|
r.WriteHeader(status)
|
|
if len(message) > 0 {
|
|
r.Write([]byte(message[0]))
|
|
}
|
|
}
|
|
|
|
func (r *TplRender) Status(status int) {
|
|
r.WriteHeader(status)
|
|
}
|
|
|
|
func (r *TplRender) prepareHTMLOptions(htmlOpt []HTMLOptions) HTMLOptions {
|
|
if len(htmlOpt) > 0 {
|
|
return htmlOpt[0]
|
|
}
|
|
|
|
return HTMLOptions{
|
|
Layout: r.Opt.Layout,
|
|
}
|
|
}
|
|
|
|
func (r *TplRender) SetTemplatePath(setName, dir string) {
|
|
if len(setName) == 0 {
|
|
setName = DEFAULT_TPL_SET_NAME
|
|
}
|
|
opt := *r.Opt
|
|
opt.Directory = dir
|
|
r.TemplateSet.Set(setName, &opt)
|
|
}
|
|
|
|
func (r *TplRender) HasTemplateSet(name string) bool {
|
|
return r.TemplateSet.Get(name) != nil
|
|
}
|
|
|
|
// DummyRender is used when user does not choose any real render to use.
|
|
// This way, we can print out friendly message which asks them to register one,
|
|
// instead of ugly and confusing 'nil pointer' panic.
|
|
type DummyRender struct {
|
|
http.ResponseWriter
|
|
}
|
|
|
|
func renderNotRegistered() {
|
|
panic("middleware render hasn't been registered")
|
|
}
|
|
|
|
func (r *DummyRender) SetResponseWriter(http.ResponseWriter) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) JSON(int, interface{}) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) JSONString(interface{}) (string, error) {
|
|
renderNotRegistered()
|
|
return "", nil
|
|
}
|
|
|
|
func (r *DummyRender) RawData(int, []byte) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) PlainText(int, []byte) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) HTML(int, string, interface{}, ...HTMLOptions) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) HTMLSet(int, string, string, interface{}, ...HTMLOptions) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) HTMLSetString(string, string, interface{}, ...HTMLOptions) (string, error) {
|
|
renderNotRegistered()
|
|
return "", nil
|
|
}
|
|
|
|
func (r *DummyRender) HTMLString(string, interface{}, ...HTMLOptions) (string, error) {
|
|
renderNotRegistered()
|
|
return "", nil
|
|
}
|
|
|
|
func (r *DummyRender) HTMLSetBytes(string, string, interface{}, ...HTMLOptions) ([]byte, error) {
|
|
renderNotRegistered()
|
|
return nil, nil
|
|
}
|
|
|
|
func (r *DummyRender) HTMLBytes(string, interface{}, ...HTMLOptions) ([]byte, error) {
|
|
renderNotRegistered()
|
|
return nil, nil
|
|
}
|
|
|
|
func (r *DummyRender) XML(int, interface{}) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) Error(int, ...string) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) Status(int) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) SetTemplatePath(string, string) {
|
|
renderNotRegistered()
|
|
}
|
|
|
|
func (r *DummyRender) HasTemplateSet(string) bool {
|
|
renderNotRegistered()
|
|
return false
|
|
}
|