Report errors when parsing Manifest and expose them in developer console.

content/renderer/manifest/manifest_parser.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/manifest/manifest_parser.h"
 
 #include "base/json/json_reader.h"
 #include "base/strings/nullable_string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/public/common/manifest.h"
 #include "content/renderer/manifest/manifest_uma_util.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace content {
 
 namespace {
 
-enum TrimType {
-  Trim,
-  NoTrim
-};
+// Helper function that returns whether the given |str| is a valid width or
+// height value for an icon sizes per:
+// https://html.spec.whatwg.org/multipage/semantics.html#attr-link-sizes
+bool IsValidIconWidthOrHeight(const std::string& str) {
+  if (str.empty() || str[0] == '0')
+    return false;
+  for (size_t i = 0; i < str.size(); ++i)
+    if (!IsAsciiDigit(str[i]))
+      return false;
+  return true;
+}
 
-base::NullableString16 ParseString(const base::DictionaryValue& dictionary,
-                                   const std::string& key,
-                                   TrimType trim) {
+// Parses the 'sizes' attribute of an icon as described in the HTML spec:
+// https://html.spec.whatwg.org/multipage/semantics.html#attr-link-sizes
+// Return a vector of gfx::Size that contains the valid sizes found. "Any" is
+// represented by gfx::Size(0, 0).
+// TODO(mlamouri): this is implemented as a separate function because it should
+// be refactored with the other icon sizes parsing implementations, see
+// http://crbug.com/416477
+std::vector<gfx::Size> ParseIconSizesHTML(const base::string16& sizes_str16) {
+  if (!base::IsStringASCII(sizes_str16))
+    return std::vector<gfx::Size>();
+
+  std::vector<gfx::Size> sizes;
+  std::string sizes_str =
+      base::StringToLowerASCII(base::UTF16ToUTF8(sizes_str16));
+  std::vector<std::string> sizes_str_list;
+  base::SplitStringAlongWhitespace(sizes_str, &sizes_str_list);
+
+  for (size_t i = 0; i < sizes_str_list.size(); ++i) {
+    std::string& size_str = sizes_str_list[i];
+    if (size_str == "any") {
+      sizes.push_back(gfx::Size(0, 0));
+      continue;
+    }
+
+    // It is expected that [0] => width and [1] => height after the split.
+    std::vector<std::string> size_list;
+    base::SplitStringDontTrim(size_str, L'x', &size_list);
+    if (size_list.size() != 2)
+      continue;
+    if (!IsValidIconWidthOrHeight(size_list[0]) ||
+        !IsValidIconWidthOrHeight(size_list[1])) {
+      continue;
+    }
+
+    int width, height;
+    if (!base::StringToInt(size_list[0], &width) ||
+        !base::StringToInt(size_list[1], &height)) {
+      continue;
+    }
+
+    sizes.push_back(gfx::Size(width, height));
+  }
+
+  return sizes;
+}
+
+const std::string& GetErrorPrefix() {
+  CR_DEFINE_STATIC_LOCAL(std::string, error_prefix,
+                         ("Manifest parsing error: "));
+  return error_prefix;
+}
+
+}  // anonymous namespace
+
+
+ManifestParser::ManifestParser(const base::StringPiece& data,
+                               const GURL& manifest_url,
+                               const GURL& document_url)
+    : data_(data),
+      manifest_url_(manifest_url),
+      document_url_(document_url),
+      failed_(false) {
+}
+
+ManifestParser::~ManifestParser() {
+}
+
+void ManifestParser::Parse() {
+  std::string parse_error;
+  scoped_ptr<base::Value> value(
+      base::JSONReader::ReadAndReturnError(data_, base::JSON_PARSE_RFC,
+                                           nullptr, &parse_error));
+
+  if (!value) {
+    errors_.push_back(GetErrorPrefix() + parse_error);
+    ManifestUmaUtil::ParseFailed();
+    failed_ = true;
+    return;
+  }
+
+  base::DictionaryValue* dictionary = nullptr;
+  if (!value->GetAsDictionary(&dictionary)) {
+    errors_.push_back(GetErrorPrefix() +
+                      "root element must be a valid JSON object.");
+    ManifestUmaUtil::ParseFailed();
+    failed_ = true;
+    return;
+  }
+  DCHECK(dictionary);
+
+  manifest_.name = ParseName(*dictionary);
+  manifest_.short_name = ParseShortName(*dictionary);
+  manifest_.start_url = ParseStartURL(*dictionary);
+  manifest_.display = ParseDisplay(*dictionary);
+  manifest_.orientation = ParseOrientation(*dictionary);
+  manifest_.icons = ParseIcons(*dictionary);
+  manifest_.gcm_sender_id = ParseGCMSenderID(*dictionary);
+
+  ManifestUmaUtil::ParseSucceeded(manifest_);
+}
+
+const Manifest& ManifestParser::manifest() const {
+  return manifest_;
+}
+
+const std::vector<std::string>& ManifestParser::errors() const {
+  return errors_;
+}
+
+bool ManifestParser::failed() const {
+  return failed_;
+}
+
+base::NullableString16 ManifestParser::ParseString(
+    const base::DictionaryValue& dictionary,
+    const std::string& key,
+    TrimType trim) {
   if (!dictionary.HasKey(key))
     return base::NullableString16();
 
   base::string16 value;
   if (!dictionary.GetString(key, &value)) {
-    // TODO(mlamouri): provide a custom message to the developer console about
-    // the property being incorrectly set.
+    errors_.push_back(GetErrorPrefix() +
+                      "property '" + key + "' ignored, type string expected.");
     return base::NullableString16();
   }
 
   if (trim == Trim)
     base::TrimWhitespace(value, base::TRIM_ALL, &value);
   return base::NullableString16(value, false);
 }
 
-// Helper function to parse URLs present on a given |dictionary| in a given
-// field identified by its |key|. The URL is first parsed as a string then
-// resolved using |base_url|.
-// Returns a GURL. If the parsing failed, the GURL will not be valid.
-GURL ParseURL(const base::DictionaryValue& dictionary,
-              const std::string& key,
-              const GURL& base_url) {
+GURL ManifestParser::ParseURL(const base::DictionaryValue& dictionary,
+                              const std::string& key,
+                              const GURL& base_url) {
   base::NullableString16 url_str = ParseString(dictionary, key, NoTrim);
   if (url_str.is_null())
     return GURL();
 
   return base_url.Resolve(url_str.string());
 }
 
-// Parses the 'name' field of the manifest, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-name-member
-// Returns the parsed string if any, a null string if the parsing failed.
-base::NullableString16 ParseName(const base::DictionaryValue& dictionary)  {
+base::NullableString16 ManifestParser::ParseName(
+    const base::DictionaryValue& dictionary)  {
   return ParseString(dictionary, "name", Trim);
 }
 
-// Parses the 'short_name' field of the manifest, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-short-name-member
-// Returns the parsed string if any, a null string if the parsing failed.
-base::NullableString16 ParseShortName(
+base::NullableString16 ManifestParser::ParseShortName(
     const base::DictionaryValue& dictionary)  {
   return ParseString(dictionary, "short_name", Trim);
 }
 
-// Parses the 'start_url' field of the manifest, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-start_url-member
-// Returns the parsed GURL if any, an empty GURL if the parsing failed.
-GURL ParseStartURL(const base::DictionaryValue& dictionary,
-                   const GURL& manifest_url,
-                   const GURL& document_url) {
-  GURL start_url = ParseURL(dictionary, "start_url", manifest_url);
+GURL ManifestParser::ParseStartURL(const base::DictionaryValue& dictionary) {
+  GURL start_url = ParseURL(dictionary, "start_url", manifest_url_);
   if (!start_url.is_valid())
     return GURL();
 
-  if (start_url.GetOrigin() != document_url.GetOrigin()) {
-    // TODO(mlamouri): provide a custom message to the developer console.
+  if (start_url.GetOrigin() != document_url_.GetOrigin()) {
+    errors_.push_back(GetErrorPrefix() + "property 'start_url' ignored, should "
+                      "be same origin as document.");
     return GURL();
   }
 
   return start_url;
 }
 
-// Parses the 'display' field of the manifest, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-display-member
-// Returns the parsed DisplayMode if any, DISPLAY_MODE_UNSPECIFIED if the
-// parsing failed.
-Manifest::DisplayMode ParseDisplay(const base::DictionaryValue& dictionary) {
+Manifest::DisplayMode ManifestParser::ParseDisplay(
+    const base::DictionaryValue& dictionary) {
   base::NullableString16 display = ParseString(dictionary, "display", Trim);
   if (display.is_null())
     return Manifest::DISPLAY_MODE_UNSPECIFIED;
 
   if (LowerCaseEqualsASCII(display.string(), "fullscreen"))
     return Manifest::DISPLAY_MODE_FULLSCREEN;
   else if (LowerCaseEqualsASCII(display.string(), "standalone"))
     return Manifest::DISPLAY_MODE_STANDALONE;
   else if (LowerCaseEqualsASCII(display.string(), "minimal-ui"))
     return Manifest::DISPLAY_MODE_MINIMAL_UI;
   else if (LowerCaseEqualsASCII(display.string(), "browser"))
     return Manifest::DISPLAY_MODE_BROWSER;
-  else
+  else {
+    errors_.push_back(GetErrorPrefix() + "unknown 'display' value ignored.");
     return Manifest::DISPLAY_MODE_UNSPECIFIED;
+  }
 }
 
-// Parses the 'orientation' field of the manifest, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-orientation-member
-// Returns the parsed WebScreenOrientationLockType if any,
-// WebScreenOrientationLockDefault if the parsing failed.
-blink::WebScreenOrientationLockType ParseOrientation(
+blink::WebScreenOrientationLockType ManifestParser::ParseOrientation(
     const base::DictionaryValue& dictionary) {
   base::NullableString16 orientation =
       ParseString(dictionary, "orientation", Trim);
 
   if (orientation.is_null())
     return blink::WebScreenOrientationLockDefault;
 
   if (LowerCaseEqualsASCII(orientation.string(), "any"))
     return blink::WebScreenOrientationLockAny;
   else if (LowerCaseEqualsASCII(orientation.string(), "natural"))
     return blink::WebScreenOrientationLockNatural;
   else if (LowerCaseEqualsASCII(orientation.string(), "landscape"))
     return blink::WebScreenOrientationLockLandscape;
   else if (LowerCaseEqualsASCII(orientation.string(), "landscape-primary"))
     return blink::WebScreenOrientationLockLandscapePrimary;
   else if (LowerCaseEqualsASCII(orientation.string(), "landscape-secondary"))
     return blink::WebScreenOrientationLockLandscapeSecondary;
   else if (LowerCaseEqualsASCII(orientation.string(), "portrait"))
     return blink::WebScreenOrientationLockPortrait;
   else if (LowerCaseEqualsASCII(orientation.string(), "portrait-primary"))
     return blink::WebScreenOrientationLockPortraitPrimary;
   else if (LowerCaseEqualsASCII(orientation.string(), "portrait-secondary"))
     return blink::WebScreenOrientationLockPortraitSecondary;
-  else
+  else {
+    errors_.push_back(GetErrorPrefix() +
+                      "unknown 'orientation' value ignored.");
     return blink::WebScreenOrientationLockDefault;
+  }
 }
 
-// Parses the 'src' field of an icon, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-src-member-of-an-icon
-// Returns the parsed GURL if any, an empty GURL if the parsing failed.
-GURL ParseIconSrc(const base::DictionaryValue& icon,
-                  const GURL& manifest_url) {
-  return ParseURL(icon, "src", manifest_url);
+GURL ManifestParser::ParseIconSrc(const base::DictionaryValue& icon) {
+  return ParseURL(icon, "src", manifest_url_);
 }
 
-// Parses the 'type' field of an icon, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-type-member-of-an-icon
-// Returns the parsed string if any, a null string if the parsing failed.
-base::NullableString16 ParseIconType(const base::DictionaryValue& icon) {
-    return ParseString(icon, "type", Trim);
+base::NullableString16 ManifestParser::ParseIconType(
+    const base::DictionaryValue& icon) {
+  return ParseString(icon, "type", Trim);
 }
 
-// Parses the 'density' field of an icon, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-a-density-member-of-an-icon
-// Returns the parsed double if any, Manifest::Icon::kDefaultDensity if the
-// parsing failed.
-double ParseIconDensity(const base::DictionaryValue& icon) {
+double ManifestParser::ParseIconDensity(const base::DictionaryValue& icon) {
   double density;
-  if (!icon.GetDouble("density", &density) || density <= 0)
+  if (!icon.HasKey("density"))
     return Manifest::Icon::kDefaultDensity;
+
+  if (!icon.GetDouble("density", &density) || density <= 0) {
+    errors_.push_back(GetErrorPrefix() +
+                      "icon 'density' ignored, must be float greater than 0.");
+    return Manifest::Icon::kDefaultDensity;
+  }
   return density;
 }
 
-// Helper function that returns whether the given |str| is a valid width or
-// height value for an icon sizes per:
-// https://html.spec.whatwg.org/multipage/semantics.html#attr-link-sizes
-bool IsValidIconWidthOrHeight(const std::string& str) {
-  if (str.empty() || str[0] == '0')
-    return false;
-  for (size_t i = 0; i < str.size(); ++i)
-    if (!IsAsciiDigit(str[i]))
-      return false;
-  return true;
-}
+std::vector<gfx::Size> ManifestParser::ParseIconSizes(
+    const base::DictionaryValue& icon) {
+  base::NullableString16 sizes_str = ParseString(icon, "sizes", NoTrim);
 
-// Parses the 'sizes' attribute of an icon as described in the HTML spec:
-// https://html.spec.whatwg.org/multipage/semantics.html#attr-link-sizes
-// Return a vector of gfx::Size that contains the valid sizes found. "Any" is
-// represented by gfx::Size(0, 0).
-// TODO(mlamouri): this is implemented as a separate function because it should
-// be refactored with the other icon sizes parsing implementations, see
-// http://crbug.com/416477
-std::vector<gfx::Size> ParseIconSizesHTML(const base::string16& sizes_str16) {
-  if (!base::IsStringASCII(sizes_str16))
+  if (sizes_str.is_null())
     return std::vector<gfx::Size>();
 
-  std::vector<gfx::Size> sizes;
-  std::string sizes_str =
-      base::StringToLowerASCII(base::UTF16ToUTF8(sizes_str16));
-  std::vector<std::string> sizes_str_list;
-  base::SplitStringAlongWhitespace(sizes_str, &sizes_str_list);
-
-  for (size_t i = 0; i < sizes_str_list.size(); ++i) {
-    std::string& size_str = sizes_str_list[i];
-    if (size_str == "any") {
-      sizes.push_back(gfx::Size(0, 0));
-      continue;
-    }
-
-    // It is expected that [0] => width and [1] => height after the split.
-    std::vector<std::string> size_list;
-    base::SplitStringDontTrim(size_str, L'x', &size_list);
-    if (size_list.size() != 2)
-      continue;
-    if (!IsValidIconWidthOrHeight(size_list[0]) ||
-        !IsValidIconWidthOrHeight(size_list[1])) {
-      continue;
-    }
-
-    int width, height;
-    if (!base::StringToInt(size_list[0], &width) ||
-        !base::StringToInt(size_list[1], &height)) {
-      continue;
-    }
-
-    sizes.push_back(gfx::Size(width, height));
+  std::vector<gfx::Size> sizes = ParseIconSizesHTML(sizes_str.string());
+  if (sizes.empty()) {
+    errors_.push_back(GetErrorPrefix() + "found icon with no valid size.");
   }
-
   return sizes;
 }
 
-// Parses the 'sizes' field of an icon, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-a-sizes-member-of-an-icon
-// Returns a vector of gfx::Size with the successfully parsed sizes, if any. An
-// empty vector if the field was not present or empty. "Any" is represented by
-// gfx::Size(0, 0).
-std::vector<gfx::Size> ParseIconSizes(const base::DictionaryValue& icon) {
-  base::NullableString16 sizes_str = ParseString(icon, "sizes", NoTrim);
-
-  return sizes_str.is_null() ? std::vector<gfx::Size>()
-                             : ParseIconSizesHTML(sizes_str.string());
-}
-
-// Parses the 'icons' field of a Manifest, as defined in:
-// http://w3c.github.io/manifest/#dfn-steps-for-processing-the-icons-member
-// Returns a vector of Manifest::Icon with the successfully parsed icons, if
-// any. An empty vector if the field was not present or empty.
-std::vector<Manifest::Icon> ParseIcons(const base::DictionaryValue& dictionary,
-                                       const GURL& manifest_url) {
+std::vector<Manifest::Icon> ManifestParser::ParseIcons(
+    const base::DictionaryValue& dictionary) {
   std::vector<Manifest::Icon> icons;
   if (!dictionary.HasKey("icons"))
     return icons;
 
-  const base::ListValue* icons_list = 0;
+  const base::ListValue* icons_list = nullptr;
   if (!dictionary.GetList("icons", &icons_list)) {
-    // TODO(mlamouri): provide a custom message to the developer console about
-    // the property being incorrectly set.
+    errors_.push_back(GetErrorPrefix() +
+                      "property 'icons' ignored, type array expected.");
     return icons;
   }
 
   for (size_t i = 0; i < icons_list->GetSize(); ++i) {
-    const base::DictionaryValue* icon_dictionary = 0;
+    const base::DictionaryValue* icon_dictionary = nullptr;
     if (!icons_list->GetDictionary(i, &icon_dictionary))
       continue;
 
     Manifest::Icon icon;
-    icon.src = ParseIconSrc(*icon_dictionary, manifest_url);
+    icon.src = ParseIconSrc(*icon_dictionary);
     // An icon MUST have a valid src. If it does not, it MUST be ignored.
     if (!icon.src.is_valid())
       continue;
     icon.type = ParseIconType(*icon_dictionary);
     icon.density = ParseIconDensity(*icon_dictionary);
     icon.sizes = ParseIconSizes(*icon_dictionary);
 
     icons.push_back(icon);
   }
 
   return icons;
 }
 
-// Parses the 'gcm_sender_id' field of the manifest.
-// This is a proprietary extension of the Web Manifest specification.
-// Returns the parsed string if any, a null string if the parsing failed.
-base::NullableString16 ParseGCMSenderID(
+base::NullableString16 ManifestParser::ParseGCMSenderID(
     const base::DictionaryValue& dictionary)  {
   return ParseString(dictionary, "gcm_sender_id", Trim);
 }
 
-} // anonymous namespace
-
-Manifest ManifestParser::Parse(const base::StringPiece& json,
-                               const GURL& manifest_url,
-                               const GURL& document_url) {
-  scoped_ptr<base::Value> value(base::JSONReader::Read(json));
-  if (!value) {
-    // TODO(mlamouri): get the JSON parsing error and report it to the developer
-    // console.
-    ManifestUmaUtil::ParseFailed();
-    return Manifest();
-  }
-
-  if (value->GetType() != base::Value::TYPE_DICTIONARY) {
-    // TODO(mlamouri): provide a custom message to the developer console.
-    ManifestUmaUtil::ParseFailed();
-    return Manifest();
-  }
-
-  base::DictionaryValue* dictionary = 0;
-  value->GetAsDictionary(&dictionary);
-  if (!dictionary) {
-    // TODO(mlamouri): provide a custom message to the developer console.
-    ManifestUmaUtil::ParseFailed();
-    return Manifest();
-  }
-
-  Manifest manifest;
-
-  manifest.name = ParseName(*dictionary);
-  manifest.short_name = ParseShortName(*dictionary);
-  manifest.start_url = ParseStartURL(*dictionary, manifest_url, document_url);
-  manifest.display = ParseDisplay(*dictionary);
-  manifest.orientation = ParseOrientation(*dictionary);
-  manifest.icons = ParseIcons(*dictionary, manifest_url);
-  manifest.gcm_sender_id = ParseGCMSenderID(*dictionary);
-
-  ManifestUmaUtil::ParseSucceeded(manifest);
-
-  return manifest;
-}
-
 } // namespace content