Componentize component_updater: Move over a bunch of files to the component.

chrome/browser/component_updater/update_response.cc

-// Copyright 2013 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 "chrome/browser/component_updater/update_response.h"
-#include <algorithm>
-#include "base/memory/scoped_ptr.h"
-#include "base/stl_util.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "base/strings/stringprintf.h"
-#include "base/version.h"
-#include "libxml/tree.h"
-#include "third_party/libxml/chromium/libxml_utils.h"
-
-namespace component_updater {
-
-static const char* kExpectedResponseProtocol = "3.0";
-
-UpdateResponse::UpdateResponse() {}
-UpdateResponse::~UpdateResponse() {}
-
-UpdateResponse::Results::Results() : daystart_elapsed_seconds(kNoDaystart) {}
-UpdateResponse::Results::~Results() {}
-
-UpdateResponse::Result::Result() {}
-
-UpdateResponse::Result::~Result() {}
-
-UpdateResponse::Result::Manifest::Manifest() {}
-UpdateResponse::Result::Manifest::~Manifest() {}
-
-UpdateResponse::Result::Manifest::Package::Package() : size(0), sizediff(0) {}
-UpdateResponse::Result::Manifest::Package::~Package() {}
-
-void UpdateResponse::ParseError(const char* details, ...) {
-  va_list args;
-  va_start(args, details);
-
-  if (!errors_.empty()) {
-    errors_ += "\r\n";
-  }
-
-  base::StringAppendV(&errors_, details, args);
-  va_end(args);
-}
-
-// Checks whether a given node's name matches |expected_name|.
-static bool TagNameEquals(const xmlNode* node, const char* expected_name) {
-  return 0 == strcmp(expected_name, reinterpret_cast<const char*>(node->name));
-}
-
-// Returns child nodes of |root| with name |name|.
-static std::vector<xmlNode*> GetChildren(xmlNode* root, const char* name) {
-  std::vector<xmlNode*> result;
-  for (xmlNode* child = root->children; child != NULL; child = child->next) {
-    if (!TagNameEquals(child, name)) {
-      continue;
-    }
-    result.push_back(child);
-  }
-  return result;
-}
-
-// Returns the value of a named attribute, or the empty string.
-static std::string GetAttribute(xmlNode* node, const char* attribute_name) {
-  const xmlChar* name = reinterpret_cast<const xmlChar*>(attribute_name);
-  for (xmlAttr* attr = node->properties; attr != NULL; attr = attr->next) {
-    if (!xmlStrcmp(attr->name, name) && attr->children &&
-        attr->children->content) {
-      return std::string(
-          reinterpret_cast<const char*>(attr->children->content));
-    }
-  }
-  return std::string();
-}
-
-// This is used for the xml parser to report errors. This assumes the context
-// is a pointer to a std::string where the error message should be appended.
-static void XmlErrorFunc(void* context, const char* message, ...) {
-  va_list args;
-  va_start(args, message);
-  std::string* error = static_cast<std::string*>(context);
-  base::StringAppendV(error, message, args);
-  va_end(args);
-}
-
-// Utility class for cleaning up the xml document when leaving a scope.
-class ScopedXmlDocument {
- public:
-  explicit ScopedXmlDocument(xmlDocPtr document) : document_(document) {}
-  ~ScopedXmlDocument() {
-    if (document_)
-      xmlFreeDoc(document_);
-  }
-
-  xmlDocPtr get() { return document_; }
-
- private:
-  xmlDocPtr document_;
-};
-
-// Parses the <package> tag.
-bool ParsePackageTag(xmlNode* package,
-                     UpdateResponse::Result* result,
-                     std::string* error) {
-  UpdateResponse::Result::Manifest::Package p;
-  p.name = GetAttribute(package, "name");
-  if (p.name.empty()) {
-    *error = "Missing name for package.";
-    return false;
-  }
-
-  p.namediff = GetAttribute(package, "namediff");
-
-  // package_fingerprint is optional. It identifies the package, preferably
-  // with a modified sha256 hash of the package in hex format.
-  p.fingerprint = GetAttribute(package, "fp");
-
-  p.hash_sha256 = GetAttribute(package, "hash_sha256");
-  int size = 0;
-  if (base::StringToInt(GetAttribute(package, "size"), &size)) {
-    p.size = size;
-  }
-
-  p.hashdiff_sha256 = GetAttribute(package, "hashdiff_sha256");
-  int sizediff = 0;
-  if (base::StringToInt(GetAttribute(package, "sizediff"), &sizediff)) {
-    p.sizediff = sizediff;
-  }
-
-  result->manifest.packages.push_back(p);
-
-  return true;
-}
-
-// Parses the <manifest> tag.
-bool ParseManifestTag(xmlNode* manifest,
-                      UpdateResponse::Result* result,
-                      std::string* error) {
-  // Get the version.
-  result->manifest.version = GetAttribute(manifest, "version");
-  if (result->manifest.version.empty()) {
-    *error = "Missing version for manifest.";
-    return false;
-  }
-  Version version(result->manifest.version);
-  if (!version.IsValid()) {
-    *error = "Invalid version: '";
-    *error += result->manifest.version;
-    *error += "'.";
-    return false;
-  }
-
-  // Get the minimum browser version (not required).
-  result->manifest.browser_min_version =
-      GetAttribute(manifest, "prodversionmin");
-  if (result->manifest.browser_min_version.length()) {
-    Version browser_min_version(result->manifest.browser_min_version);
-    if (!browser_min_version.IsValid()) {
-      *error = "Invalid prodversionmin: '";
-      *error += result->manifest.browser_min_version;
-      *error += "'.";
-      return false;
-    }
-  }
-
-  // Get the <packages> node.
-  std::vector<xmlNode*> packages = GetChildren(manifest, "packages");
-  if (packages.empty()) {
-    *error = "Missing packages tag on manifest.";
-    return false;
-  }
-
-  // Parse each of the <package> tags.
-  std::vector<xmlNode*> package = GetChildren(packages[0], "package");
-  for (size_t i = 0; i != package.size(); ++i) {
-    if (!ParsePackageTag(package[i], result, error))
-      return false;
-  }
-
-  return true;
-}
-
-// Parses the <urls> tag and its children in the <updatecheck>.
-bool ParseUrlsTag(xmlNode* urls,
-                  UpdateResponse::Result* result,
-                  std::string* error) {
-  // Get the url nodes.
-  std::vector<xmlNode*> url = GetChildren(urls, "url");
-  if (url.empty()) {
-    *error = "Missing url tags on urls.";
-    return false;
-  }
-
-  // Get the list of urls for full and optionally, for diff updates.
-  // There can only be either a codebase or a codebasediff attribute in a tag.
-  for (size_t i = 0; i != url.size(); ++i) {
-    // Find the url to the crx file.
-    const GURL crx_url(GetAttribute(url[i], "codebase"));
-    if (crx_url.is_valid()) {
-      result->crx_urls.push_back(crx_url);
-      continue;
-    }
-    const GURL crx_diffurl(GetAttribute(url[i], "codebasediff"));
-    if (crx_diffurl.is_valid()) {
-      result->crx_diffurls.push_back(crx_diffurl);
-      continue;
-    }
-  }
-
-  // Expect at least one url for full update.
-  if (result->crx_urls.empty()) {
-    *error = "Missing valid url for full update.";
-    return false;
-  }
-
-  return true;
-}
-
-// Parses the <updatecheck> tag.
-bool ParseUpdateCheckTag(xmlNode* updatecheck,
-                         UpdateResponse::Result* result,
-                         std::string* error) {
-  if (GetAttribute(updatecheck, "status") == "noupdate") {
-    return true;
-  }
-
-  // Get the <urls> tag.
-  std::vector<xmlNode*> urls = GetChildren(updatecheck, "urls");
-  if (urls.empty()) {
-    *error = "Missing urls on updatecheck.";
-    return false;
-  }
-
-  if (!ParseUrlsTag(urls[0], result, error)) {
-    return false;
-  }
-
-  std::vector<xmlNode*> manifests = GetChildren(updatecheck, "manifest");
-  if (urls.empty()) {
-    *error = "Missing urls on updatecheck.";
-    return false;
-  }
-
-  return ParseManifestTag(manifests[0], result, error);
-}
-
-// Parses a single <app> tag.
-bool ParseAppTag(xmlNode* app,
-                 UpdateResponse::Result* result,
-                 std::string* error) {
-  // Read the crx id.
-  result->extension_id = GetAttribute(app, "appid");
-  if (result->extension_id.empty()) {
-    *error = "Missing appid on app node";
-    return false;
-  }
-
-  // Get the <updatecheck> tag.
-  std::vector<xmlNode*> updates = GetChildren(app, "updatecheck");
-  if (updates.empty()) {
-    *error = "Missing updatecheck on app.";
-    return false;
-  }
-
-  return ParseUpdateCheckTag(updates[0], result, error);
-}
-
-bool UpdateResponse::Parse(const std::string& response_xml) {
-  results_.daystart_elapsed_seconds = kNoDaystart;
-  results_.list.clear();
-  errors_.clear();
-
-  if (response_xml.length() < 1) {
-    ParseError("Empty xml");
-    return false;
-  }
-
-  std::string xml_errors;
-  ScopedXmlErrorFunc error_func(&xml_errors, &XmlErrorFunc);
-
-  // Start up the xml parser with the manifest_xml contents.
-  ScopedXmlDocument document(
-      xmlParseDoc(reinterpret_cast<const xmlChar*>(response_xml.c_str())));
-  if (!document.get()) {
-    ParseError("%s", xml_errors.c_str());
-    return false;
-  }
-
-  xmlNode* root = xmlDocGetRootElement(document.get());
-  if (!root) {
-    ParseError("Missing root node");
-    return false;
-  }
-
-  if (!TagNameEquals(root, "response")) {
-    ParseError("Missing response tag");
-    return false;
-  }
-
-  // Check for the response "protocol" attribute.
-  if (GetAttribute(root, "protocol") != kExpectedResponseProtocol) {
-    ParseError(
-        "Missing/incorrect protocol on response tag "
-        "(expected '%s')",
-        kExpectedResponseProtocol);
-    return false;
-  }
-
-  // Parse the first <daystart> if it is present.
-  std::vector<xmlNode*> daystarts = GetChildren(root, "daystart");
-  if (!daystarts.empty()) {
-    xmlNode* first = daystarts[0];
-    std::string elapsed_seconds = GetAttribute(first, "elapsed_seconds");
-    int parsed_elapsed = kNoDaystart;
-    if (base::StringToInt(elapsed_seconds, &parsed_elapsed)) {
-      results_.daystart_elapsed_seconds = parsed_elapsed;
-    }
-  }
-
-  // Parse each of the <app> tags.
-  std::vector<xmlNode*> apps = GetChildren(root, "app");
-  for (size_t i = 0; i != apps.size(); ++i) {
-    Result result;
-    std::string error;
-    if (ParseAppTag(apps[i], &result, &error)) {
-      results_.list.push_back(result);
-    } else {
-      ParseError("%s", error.c_str());
-    }
-  }
-
-  return true;
-}
-
-}  // namespace component_updater