components/dom_distiller/core/viewer.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/dom_distiller/core/viewer.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/json/json_writer.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/strings/string_util.h"
  14 #include "components/dom_distiller/core/distilled_page_prefs.h"
  15 #include "components/dom_distiller/core/dom_distiller_service.h"
  16 #include "components/dom_distiller/core/proto/distilled_article.pb.h"
  17 #include "components/dom_distiller/core/proto/distilled_page.pb.h"
  18 #include "components/dom_distiller/core/task_tracker.h"
  19 #include "components/dom_distiller/core/url_constants.h"
  20 #include "components/dom_distiller/core/url_utils.h"
  21 #include "grit/components_resources.h"
  22 #include "grit/components_strings.h"
  23 #include "net/base/escape.h"
  24 #include "net/url_request/url_request.h"
  25 #include "ui/base/l10n/l10n_util.h"
  26 #include "ui/base/resource/resource_bundle.h"
  27 #include "url/gurl.h"
  28
  29 namespace dom_distiller {
  30
  31 namespace {
  32
  33 // JS Themes. Must agree with useTheme() in dom_distiller_viewer.js.
  34 const char kDarkJsTheme[] = "dark";
  35 const char kLightJsTheme[] = "light";
  36 const char kSepiaJsTheme[] = "sepia";
  37
  38 // CSS Theme classes.  Must agree with classes in distilledpage.css.
  39 const char kDarkCssClass[] = "dark";
  40 const char kLightCssClass[] = "light";
  41 const char kSepiaCssClass[] = "sepia";
  42
  43 // JS FontFamilies. Must agree with useFontFamily() in dom_distiller_viewer.js.
  44 const char kSerifJsFontFamily[] = "serif";
  45 const char kSansSerifJsFontFamily[] = "sans-serif";
  46 const char kMonospaceJsFontFamily[] = "monospace";
  47
  48 // CSS FontFamily classes.  Must agree with classes in distilledpage.css.
  49 const char kSerifCssClass[] = "serif";
  50 const char kSansSerifCssClass[] = "sans-serif";
  51 const char kMonospaceCssClass[] = "monospace";
  52
  53 // Maps themes to JS themes.
  54 const std::string GetJsTheme(DistilledPagePrefs::Theme theme) {
  55   if (theme == DistilledPagePrefs::DARK) {
  56     return kDarkJsTheme;
  57   } else if (theme == DistilledPagePrefs::SEPIA) {
  58     return kSepiaJsTheme;
  59   }
  60   return kLightJsTheme;
  61 }
  62
  63 // Maps themes to CSS classes.
  64 const std::string GetThemeCssClass(DistilledPagePrefs::Theme theme) {
  65   if (theme == DistilledPagePrefs::DARK) {
  66     return kDarkCssClass;
  67   } else if (theme == DistilledPagePrefs::SEPIA) {
  68     return kSepiaCssClass;
  69   }
  70   return kLightCssClass;
  71 }
  72
  73 // Maps font families to JS font families.
  74 const std::string GetJsFontFamily(DistilledPagePrefs::FontFamily font_family) {
  75   if (font_family == DistilledPagePrefs::SERIF) {
  76     return kSerifJsFontFamily;
  77   } else if (font_family == DistilledPagePrefs::MONOSPACE) {
  78     return kMonospaceJsFontFamily;
  79   }
  80   return kSansSerifJsFontFamily;
  81 }
  82
  83 // Maps fontFamilies to CSS fontFamily classes.
  84 const std::string GetFontCssClass(DistilledPagePrefs::FontFamily font_family) {
  85   if (font_family == DistilledPagePrefs::SERIF) {
  86     return kSerifCssClass;
  87   } else if (font_family == DistilledPagePrefs::MONOSPACE) {
  88     return kMonospaceCssClass;
  89   }
  90   return kSansSerifCssClass;
  91 }
  92
  93 void EnsureNonEmptyTitle(std::string* title) {
  94   if (title->empty())
  95     *title = l10n_util::GetStringUTF8(IDS_DOM_DISTILLER_VIEWER_NO_DATA_TITLE);
  96 }
  97
  98 void EnsureNonEmptyContent(std::string* content) {
  99   UMA_HISTOGRAM_BOOLEAN("DomDistiller.PageHasDistilledData", !content->empty());
 100   if (content->empty()) {
 101     *content = l10n_util::GetStringUTF8(
 102         IDS_DOM_DISTILLER_VIEWER_NO_DATA_CONTENT);
 103   }
 104 }
 105
 106 std::string ReplaceHtmlTemplateValues(
 107     const std::string& title,
 108     const std::string& textDirection,
 109     const std::string& loading_indicator_class,
 110     const std::string& original_url,
 111     const DistilledPagePrefs::Theme theme,
 112     const DistilledPagePrefs::FontFamily font_family) {
 113   base::StringPiece html_template =
 114       ResourceBundle::GetSharedInstance().GetRawDataResource(
 115           IDR_DOM_DISTILLER_VIEWER_HTML);
 116   // TODO(mdjones): Many or all of these substitutions can be placed on the
 117   // page via JavaScript.
 118   std::vector<std::string> substitutions;
 119   substitutions.push_back(title);                                         // $1
 120
 121   std::ostringstream css;
 122   std::ostringstream script;
 123 #if defined(OS_IOS)
 124   // On iOS the content is inlined as there is no API to detect those requests
 125   // and return the local data once a page is loaded.
 126   css << "<style>" << viewer::GetCss() << "</style>";
 127   script << "<script>\n" << viewer::GetJavaScript() << "\n</script>";
 128 #else
 129   css << "<link rel=\"stylesheet\" href=\"/" << kViewerCssPath << "\">";
 130   script << "<script src=\"" << kViewerJsPath << "\"></script>";
 131 #endif  // defined(OS_IOS)
 132   substitutions.push_back(css.str());                                     // $2
 133   substitutions.push_back(script.str());                                  // $3
 134
 135   substitutions.push_back(GetThemeCssClass(theme) + " " +
 136                           GetFontCssClass(font_family));                  // $4
 137   substitutions.push_back(loading_indicator_class);                       // $5
 138   substitutions.push_back(original_url);                                  // $6
 139   substitutions.push_back(
 140       l10n_util::GetStringUTF8(IDS_DOM_DISTILLER_VIEWER_VIEW_ORIGINAL));  // $7
 141   substitutions.push_back(textDirection);                                 // $8
 142
 143   return ReplaceStringPlaceholders(html_template, substitutions, NULL);
 144 }
 145
 146 }  // namespace
 147
 148 namespace viewer {
 149
 150 const std::string GetShowFeedbackFormJs() {
 151   base::StringValue question_val(
 152       l10n_util::GetStringUTF8(IDS_DOM_DISTILLER_QUALITY_QUESTION));
 153   base::StringValue no_val(
 154       l10n_util::GetStringUTF8(IDS_DOM_DISTILLER_QUALITY_ANSWER_NO));
 155   base::StringValue yes_val(
 156       l10n_util::GetStringUTF8(IDS_DOM_DISTILLER_QUALITY_ANSWER_YES));
 157
 158   std::string question;
 159   std::string yes;
 160   std::string no;
 161
 162   base::JSONWriter::Write(&question_val, &question);
 163   base::JSONWriter::Write(&yes_val, &yes);
 164   base::JSONWriter::Write(&no_val, &no);
 165
 166   return "showFeedbackForm(" + question + ", " + yes + ", " + no + ");";
 167 }
 168
 169 const std::string GetUnsafeIncrementalDistilledPageJs(
 170     const DistilledPageProto* page_proto,
 171     const bool is_last_page) {
 172   std::string output(page_proto->html());
 173   EnsureNonEmptyContent(&output);
 174   base::StringValue value(output);
 175   base::JSONWriter::Write(&value, &output);
 176   std::string page_update("addToPage(");
 177   page_update += output + ");";
 178   return page_update + GetToggleLoadingIndicatorJs(
 179       is_last_page);
 180
 181 }
 182
 183 const std::string GetErrorPageJs() {
 184   base::StringValue value(l10n_util::GetStringUTF8(
 185       IDS_DOM_DISTILLER_VIEWER_FAILED_TO_FIND_ARTICLE_CONTENT));
 186   std::string output;
 187   base::JSONWriter::Write(&value, &output);
 188   std::string page_update("addToPage(");
 189   page_update += output + ");";
 190   return page_update;
 191 }
 192
 193 const std::string GetToggleLoadingIndicatorJs(const bool is_last_page) {
 194   if (is_last_page)
 195     return "showLoadingIndicator(true);";
 196   else
 197     return "showLoadingIndicator(false);";
 198 }
 199
 200 const std::string GetUnsafeArticleTemplateHtml(
 201     const DistilledPageProto* page_proto,
 202     const DistilledPagePrefs::Theme theme,
 203     const DistilledPagePrefs::FontFamily font_family) {
 204   DCHECK(page_proto);
 205
 206   std::string title = net::EscapeForHTML(page_proto->title());
 207
 208   EnsureNonEmptyTitle(&title);
 209
 210   std::string text_direction = page_proto->text_direction();
 211   std::string original_url = page_proto->url();
 212
 213   return ReplaceHtmlTemplateValues(title, text_direction, "hidden",
 214                                    original_url, theme, font_family);
 215 }
 216
 217 const std::string GetUnsafeArticleContentJs(
 218     const DistilledArticleProto* article_proto) {
 219   DCHECK(article_proto);
 220   std::ostringstream unsafe_output_stream;
 221   if (article_proto->pages_size() > 0 && article_proto->pages(0).has_html()) {
 222     for (int page_num = 0; page_num < article_proto->pages_size(); ++page_num) {
 223       unsafe_output_stream << article_proto->pages(page_num).html();
 224     }
 225   }
 226
 227   std::string output(unsafe_output_stream.str());
 228   EnsureNonEmptyContent(&output);
 229   base::StringValue value(output);
 230   base::JSONWriter::Write(&value, &output);
 231   std::string page_update("addToPage(");
 232   page_update += output + ");";
 233   return page_update + GetToggleLoadingIndicatorJs(true);
 234 }
 235
 236 const std::string GetErrorPageHtml(
 237     const DistilledPagePrefs::Theme theme,
 238     const DistilledPagePrefs::FontFamily font_family) {
 239   std::string title = l10n_util::GetStringUTF8(
 240       IDS_DOM_DISTILLER_VIEWER_FAILED_TO_FIND_ARTICLE_TITLE);
 241   return ReplaceHtmlTemplateValues(title, "auto", "hidden", "", theme,
 242                                    font_family);
 243 }
 244
 245 const std::string GetCss() {
 246   return ResourceBundle::GetSharedInstance().GetRawDataResource(
 247           IDR_DISTILLER_CSS).as_string();
 248 }
 249
 250 const std::string GetJavaScript() {
 251   return ResourceBundle::GetSharedInstance()
 252       .GetRawDataResource(IDR_DOM_DISTILLER_VIEWER_JS)
 253       .as_string();
 254 }
 255
 256 scoped_ptr<ViewerHandle> CreateViewRequest(
 257     DomDistillerServiceInterface* dom_distiller_service,
 258     const std::string& path,
 259     ViewRequestDelegate* view_request_delegate,
 260     const gfx::Size& render_view_size) {
 261   std::string entry_id =
 262       url_utils::GetValueForKeyInUrlPathQuery(path, kEntryIdKey);
 263   bool has_valid_entry_id = !entry_id.empty();
 264   entry_id = StringToUpperASCII(entry_id);
 265
 266   std::string requested_url_str =
 267       url_utils::GetValueForKeyInUrlPathQuery(path, kUrlKey);
 268   GURL requested_url(requested_url_str);
 269   bool has_valid_url = url_utils::IsUrlDistillable(requested_url);
 270
 271   if (has_valid_entry_id && has_valid_url) {
 272     // It is invalid to specify a query param for both |kEntryIdKey| and
 273     // |kUrlKey|.
 274     return scoped_ptr<ViewerHandle>();
 275   }
 276
 277   if (has_valid_entry_id) {
 278     return dom_distiller_service->ViewEntry(
 279         view_request_delegate,
 280         dom_distiller_service->CreateDefaultDistillerPage(render_view_size),
 281         entry_id).Pass();
 282   } else if (has_valid_url) {
 283     return dom_distiller_service->ViewUrl(
 284         view_request_delegate,
 285         dom_distiller_service->CreateDefaultDistillerPage(render_view_size),
 286         requested_url).Pass();
 287   }
 288
 289   // It is invalid to not specify a query param for |kEntryIdKey| or |kUrlKey|.
 290   return scoped_ptr<ViewerHandle>();
 291 }
 292
 293 const std::string GetDistilledPageThemeJs(DistilledPagePrefs::Theme theme) {
 294   return "useTheme('" + GetJsTheme(theme) + "');";
 295 }
 296
 297 const std::string GetDistilledPageFontFamilyJs(
 298     DistilledPagePrefs::FontFamily font_family) {
 299   return "useFontFamily('" + GetJsFontFamily(font_family) + "');";
 300 }
 301
 302 }  // namespace viewer
 303
 304 }  // namespace dom_distiller