Add file upload functionality

Adds an :allow_uploads wiki option, an --allow-uploads flag to
bin/gollum, an "Upload" button with a file upload dialog, and a
handler to commit uploaded files into the repository.

:allow_uploads defaults to false, to prevent unauthenticated users
from uploading arbitrary files into the repository (albeit only in
the uploads directory).

This code is based on the patch from @l3iggs at
https://github.com/gollum/gollum/issues/694, but the handling on the
backend is completely rewritten to use the Committer infrastructure.

bin/gollum

@@ -19,7 +19,10 @@ require 'gollum'
 
 exec = {}
 options = { 'port' => 4567, 'bind' => '0.0.0.0' }
-wiki_options = { :live_preview => false }
+wiki_options = {
+    :live_preview => false,
+    :allow_uploads => false,
+}
 
 opts = OptionParser.new do |opts|
   opts.banner = help
@@ -77,6 +80,10 @@ opts = OptionParser.new do |opts|
     wiki_options[:live_preview] = true
   end
 
+  opts.on("--allow-uploads", "Allows file uploads.") do
+    wiki_options[:allow_uploads] = true
+  end
+
   opts.on("--mathjax", "Enables mathjax.") do
     wiki_options[:mathjax] = true
   end

lib/gollum/app.rb

@@ -13,6 +13,10 @@ require 'gollum/views/has_page'
 
 require File.expand_path '../helpers', __FILE__
 
+#required to upload bigger binary files
+Grit::Git.git_timeout = 120 # timeout in secs
+Grit::Git.git_max_size = 190 * 10**6 # size in bytes (10^6=1 MB)
+
 # Fix to_url
 class String
   alias :upstream_to_url :to_url
@@ -146,6 +150,53 @@ module Precious
       end
     end
 
+    post '/uploadFile' do
+      wiki = wiki_new
+
+      unless wiki.allow_uploads
+        @message = "File uploads are disabled"
+        mustache :error
+        return
+      end
+
+      if params[:file]
+        fullname = params[:file][:filename]
+        tempfile = params[:file][:tempfile]
+      end
+
+      dir = 'uploads'
+      ext = ::File.extname(fullname)
+      format = ext.split('.').last || 'txt'
+      filename = ::File.basename(fullname, ext)
+      contents = ::File.read(tempfile)
+      reponame = filename + '.' + format
+
+      head = wiki.repo.head
+
+      options = {
+        :message => "Uploaded file to uploads/#{reponame}",
+        :parent => wiki.repo.head.commit,
+      }
+      author = session['gollum.author']
+      unless author.nil?
+        options.merge! author
+      end
+
+      begin
+        committer = Gollum::Committer.new(wiki, options)
+        committer.add_to_index(dir, filename, format, contents)
+        committer.after_commit do |committer, sha|
+          wiki.clear_cache
+          committer.update_working_dir(dir, filename, format)
+        end
+        committer.commit
+        redirect to('/')
+      rescue Gollum::DuplicatePageError => e
+        @message = "Duplicate page: #{e.message}"
+        mustache :error
+      end
+    end
+
     post '/rename/*' do
       wikip     = wiki_page(params[:splat].first)
       halt 500 if wikip.nil?
@@ -283,6 +334,7 @@ module Precious
       @mathjax = wiki.mathjax
       @h1_title = wiki.h1_title
       @editable = false
+      @allow_uploads = wiki.allow_uploads
       mustache :page
     end
 
@@ -401,6 +453,7 @@ module Precious
         @mathjax  = wiki.mathjax
         @h1_title = wiki.h1_title
         @bar_side  = wiki.bar_side
+        @allow_uploads = wiki.allow_uploads
 
         mustache :page
       elsif file = wiki.file(fullpath, wiki.ref, true)

lib/gollum/public/gollum/javascript/gollum.dialog.js

@@ -37,11 +37,14 @@
           fieldMarkup += '<div class="field">';
           switch ( fieldArray[i].type ) {
 
-          // only text is supported for now
           case 'text':
             fieldMarkup += Dialog.createFieldText( fieldArray[i] );
             break;
 
+          case 'file':
+            fieldMarkup += Dialog.createFieldFile( fieldArray[i] );
+            break;
+
           default:
             break;
 
@@ -86,6 +89,22 @@
       return html;
     },
 
+    createFieldFile: function( fieldAttributes ) {
+      // Not actually a field, but an embedded form.
+      var html = '';
+
+      var id = fieldAttributes.id || 'upload';
+      var name = fieldAttributes.name || 'file';
+      var action = fieldAttributes.action || 'uploadFile';
+
+      html += '<form method=post enctype="multipart/form-data" ' +
+        'action="' + action + '" ' + 'id="' + id + '">';
+      html += '<input type=file name="' + name + '">';
+      html += '</form>';
+
+      return html;
+    },
+
     createMarkup: function( title, body ) {
       Dialog.markupCreated = true;
       if ($.facebox) {

lib/gollum/public/gollum/javascript/gollum.js

@@ -145,6 +145,25 @@ $(document).ready(function() {
     }
   }
 
+  if ($('#minibutton-upload-page').length) {
+    $('#minibutton-upload-page').parent().removeClass('jaws');
+    $('#minibutton-upload-page').click(function(e) {
+      e.preventDefault();
+
+      $.GollumDialog.init({
+        title: 'Upload File',
+        fields: [
+          {
+            type:   'file'
+          }
+        ],
+        OK: function( res ) {
+          $('#upload').submit();
+        }
+      });
+    });
+  }
+
   if ($('#minibutton-rename-page').length) {
     $('#minibutton-rename-page').parent().removeClass('jaws');
     $('#minibutton-rename-page').click(function(e) {

lib/gollum/templates/page.mustache

@@ -20,6 +20,10 @@ Mousetrap.bind(['e'], function( e ) {
     class="action-fileview">Files</a></li>
     <li class="minibutton jaws">
       <a href="#" id="minibutton-new-page">New</a></li>
+    {{#allow_uploads}}
+    <li class="minibutton jaws">
+      <a href="#" id="minibutton-upload-page">Upload</a></li>
+    {{/allow_uploads}}
     {{#editable}}
     <li class="minibutton jaws">
       <a href="#" id="minibutton-rename-page">Rename</a></li>

lib/gollum/views/page.rb

@@ -39,6 +39,10 @@ module Precious
         @editable
       end
 
+      def allow_uploads
+        @allow_uploads
+      end
+
       def has_header
         @header = (@page.header || false) if @header.nil?
         !!@header