REVIEW: obtain mime type from file path only on IO allowed sequence

atom/browser/net/asar/url_request_asar_job.cc

@@ -101,24 +101,20 @@ void URLRequestAsarJob::InitializeFileJob(
 }
 
 void URLRequestAsarJob::Start() {
-  if (type_ == TYPE_ASAR) {
-    int flags = base::File::FLAG_OPEN |
-                base::File::FLAG_READ |
-                base::File::FLAG_ASYNC;
-    int rv = stream_->Open(archive_->path(), flags,
-                           base::Bind(&URLRequestAsarJob::DidOpen,
-                                      weak_ptr_factory_.GetWeakPtr()));
-    if (rv != net::ERR_IO_PENDING)
-      DidOpen(rv);
-  } else if (type_ == TYPE_FILE) {
+  if (type_ == TYPE_ASAR || type_ == TYPE_FILE) {
     auto* meta_info = new FileMetaInfo();
+    if (type_ == TYPE_ASAR) {
+      meta_info->file_path = archive_->path();
+      meta_info->file_exists = true;
+      meta_info->is_directory = false;
+      meta_info->file_size = file_info_.size;
+    }
     file_task_runner_->PostTaskAndReply(
         FROM_HERE,
-        base::Bind(&URLRequestAsarJob::FetchMetaInfo, file_path_,
+        base::Bind(&URLRequestAsarJob::FetchMetaInfo, file_path_, type_,
                    base::Unretained(meta_info)),
         base::Bind(&URLRequestAsarJob::DidFetchMetaInfo,
-                   weak_ptr_factory_.GetWeakPtr(),
-                   base::Owned(meta_info)));
+                   weak_ptr_factory_.GetWeakPtr(), base::Owned(meta_info)));
   } else {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
@@ -194,16 +190,12 @@ std::unique_ptr<net::SourceStream> URLRequestAsarJob::SetUpSourceStream() {
 }
 
 bool URLRequestAsarJob::GetMimeType(std::string* mime_type) const {
-  if (type_ == TYPE_ASAR) {
-    return net::GetMimeTypeFromFile(file_path_, mime_type);
-  } else {
   if (meta_info_.mime_type_result) {
     *mime_type = meta_info_.mime_type;
     return true;
   }
   return false;
 }
-}
 
 void URLRequestAsarJob::SetExtraRequestHeaders(
     const net::HttpRequestHeaders& headers) {
@@ -238,13 +230,17 @@ void URLRequestAsarJob::GetResponseInfo(net::HttpResponseInfo* info) {
 }
 
 void URLRequestAsarJob::FetchMetaInfo(const base::FilePath& file_path,
+                                      JobType type,
                                       FileMetaInfo* meta_info) {
+  if (type == TYPE_FILE) {
     base::File::Info file_info;
     meta_info->file_exists = base::GetFileInfo(file_path, &file_info);
     if (meta_info->file_exists) {
+      meta_info->file_path = file_path;
       meta_info->file_size = file_info.size;
       meta_info->is_directory = file_info.is_directory;
     }
+  }
   // On Windows GetMimeTypeFromFile() goes to the registry. Thus it should be
   // done in WorkerPool.
   meta_info->mime_type_result =
@@ -261,9 +257,9 @@ void URLRequestAsarJob::DidFetchMetaInfo(const FileMetaInfo* meta_info) {
   int flags = base::File::FLAG_OPEN |
               base::File::FLAG_READ |
               base::File::FLAG_ASYNC;
-  int rv = stream_->Open(file_path_, flags,
-                         base::Bind(&URLRequestAsarJob::DidOpen,
-                                    weak_ptr_factory_.GetWeakPtr()));
+  int rv = stream_->Open(
+      meta_info_.file_path, flags,
+      base::Bind(&URLRequestAsarJob::DidOpen, weak_ptr_factory_.GetWeakPtr()));
   if (rv != net::ERR_IO_PENDING)
     DidOpen(rv);
 }

atom/browser/net/asar/url_request_asar_job.h

@@ -63,6 +63,13 @@ class URLRequestAsarJob : public net::URLRequestJob {
   void GetResponseInfo(net::HttpResponseInfo* info) override;
 
  private:
+  // The type of this job.
+  enum JobType {
+    TYPE_ERROR,
+    TYPE_ASAR,
+    TYPE_FILE,
+  };
+
   // Meta information about the file. It's used as a member in the
   // URLRequestFileJob and also passed between threads because disk access is
   // necessary to obtain it.
@@ -80,10 +87,13 @@ class URLRequestAsarJob : public net::URLRequestJob {
     bool file_exists;
     // Flag showing whether the file name actually refers to a directory.
     bool is_directory;
+    // Path to the file.
+    base::FilePath file_path;
   };
 
   // Fetches file info on a background thread.
   static void FetchMetaInfo(const base::FilePath& file_path,
+                            JobType type,
                             FileMetaInfo* meta_info);
 
   // Callback after fetching file info on a background thread.
@@ -99,12 +109,6 @@ class URLRequestAsarJob : public net::URLRequestJob {
   // Callback after data is asynchronously read from the file into |buf|.
   void DidRead(scoped_refptr<net::IOBuffer> buf, int result);
 
-  // The type of this job.
-  enum JobType {
-    TYPE_ERROR,
-    TYPE_ASAR,
-    TYPE_FILE,
-  };
   JobType type_;
 
   std::shared_ptr<Archive> archive_;

atom/browser/ui/webui/pdf_viewer_ui.cc

@@ -29,7 +29,6 @@
 #include "content/public/browser/web_contents.h"
 #include "grit/pdf_viewer_resources_map.h"
 #include "net/base/load_flags.h"
-#include "net/base/mime_util.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 #include "ui/base/resource/resource_bundle.h"
@@ -79,10 +78,26 @@ class BundledDataSource : public content::URLDataSource {
 
   std::string GetMimeType(const std::string& path) const override {
     std::string filename = PathWithoutParams(path);
-    std::string mime_type;
-    net::GetMimeTypeFromFile(
-        base::FilePath::FromUTF8Unsafe(filename), &mime_type);
-    return mime_type;
+    if (base::EndsWith(filename, ".html",
+                       base::CompareCase::INSENSITIVE_ASCII)) {
+      return "text/html";
+    } else if (base::EndsWith(filename, ".css",
+                              base::CompareCase::INSENSITIVE_ASCII)) {
+      return "text/css";
+    } else if (base::EndsWith(filename, ".js",
+                              base::CompareCase::INSENSITIVE_ASCII)) {
+      return "application/javascript";
+    } else if (base::EndsWith(filename, ".png",
+                              base::CompareCase::INSENSITIVE_ASCII)) {
+      return "image/png";
+    } else if (base::EndsWith(filename, ".gif",
+                              base::CompareCase::INSENSITIVE_ASCII)) {
+      return "image/gif";
+    } else if (base::EndsWith(filename, ".svg",
+                              base::CompareCase::INSENSITIVE_ASCII)) {
+      return "image/svg+xml";
+    }
+    return "text/html";
   }
 
   bool ShouldAddContentSecurityPolicy() const override { return false; }