Default share to Share Target: Partial impl. of Web Share for Desktop.

chrome/browser/webshare/share_service_impl.cc

 // Copyright 2016 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/webshare/share_service_impl.h"
 
-#include "base/memory/ptr_util.h"
+#include <algorithm>
+#include <functional>
+#include <utility>
+
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_commands.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_tabstrip.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
+#include "net/base/escape.h"
+
+namespace {
+bool IsAlNum(char c) {
+  return ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||

[Sam McNally, 2017/01/10 06:53:50]

return base::IsAsciiAlpha(c) || base::IsAsciiDigit(c);

(from base/strings/string_util.h)

[constantina, 2017/01/12 04:04:40]

Done.

+          (c >= '0' && c <= '9'));
+}
+
+// Splits |url_template| on "{" and "}", and stores in |split_template|.
+// Returns true if it successfully split the template, and false if an error
+// occurred. That is, if two "{" occur before a "}", a "{" occurs with no
+// following "}", or a "{" occurs with no preceding "%}".
+// Ensures elements at odd indices of |split_template| are the substrings
+// between "{" and "}" in the |url_template|. Thus, if "}" was immediately
+// followed by "{", an empty string is stored, or if there are no characters
+// before the first delimiter, the first element is "" (similar applies to the
+// last element). For example:
+// Input: "abc{def}{ghi}"
+// Output: {"abc", "def", "", "ghi", ""}.
+// This means that the returned value is always of odd size.
+bool SplitTemplate(const base::StringPiece& url_template,

[Sam McNally, 2017/01/10 06:53:50]

Take StringPiece by value.

[constantina, 2017/01/12 04:04:41]

func is gone

+                   std::vector<base::StringPiece>* split_template) {
+  // Find open ("{") and close ("}") delimiters, and record indices.
+  // If two opens occur before a close, or a close occurs with no preceding
+  // open, return an error.
+  std::vector<size_t> delimiter_indices;
+  bool last_saw_open = false;
+  for (size_t i = 0; i < url_template.size(); ++i) {
+    if (last_saw_open) {
+      if (url_template[i] == '}') {
+        last_saw_open = false;
+        delimiter_indices.push_back(i + 1);
+      } else if (!IsAlNum(url_template[i]) && url_template[i] != '_' &&
+                 url_template[i] != '-') {
+        // Error: Non-identifier character seen after open.
+        return false;
+      }
+    } else if (!last_saw_open) {
+      if (url_template[i] == '}') {
+        // Error: Saw close, with no corresponding open.
+        return false;
+      } else if (url_template[i] == '{') {
+        last_saw_open = true;
+        delimiter_indices.push_back(i);
+      }
+    }
+  }
+  if (last_saw_open) {
+    // Error: Saw open that was never closed.
+    return false;
+  }
+
+  // Split |url_template| at the indices given by |delimiter_indices|.
+  split_template->clear();
+  int start_index_to_copy = 0;

[Sam McNally, 2017/01/10 06:53:50]

size_t

[constantina, 2017/01/12 04:04:41]

Gone.

+  for (size_t i = 0; i < delimiter_indices.size(); ++i) {

[Sam McNally, 2017/01/10 06:53:50]

for (auto delimiter_index : delimiter_indices) {

[constantina, 2017/01/12 04:04:41]

Gone.

+    split_template->push_back(url_template.substr(
+        start_index_to_copy, delimiter_indices[i] - start_index_to_copy));
+    start_index_to_copy = delimiter_indices[i];
+  }
+  split_template->push_back(url_template.substr(
+      start_index_to_copy, url_template.size() - start_index_to_copy));
+
+  // Remove { and } from placeholders (odd-indexed elements) in
+  // |*split_template|.
+  for (size_t i = 1; i < split_template->size(); i += 2) {
+    base::StringPiece& placeholder = (*split_template)[i];
+    placeholder = placeholder.substr(1, placeholder.size() - 2);
+  }
+  return true;
+}
+
+// Joins a std::vector<base::StringPiece> into a single std::string.
+std::string JoinString(const std::vector<base::StringPiece>& pieces) {
+  std::string joined_pieces;

[Sam McNally, 2017/01/10 06:53:50]

Declare this closer to where it's used.

[constantina, 2017/01/12 04:04:41]

Done.

+
+  size_t total_size = 0;
+  for (const base::StringPiece piece : pieces) {

[Sam McNally, 2017/01/10 06:53:50]

const auto&

[constantina, 2017/01/12 04:04:41]

Done.

+    total_size += piece.size();
+  }
+  joined_pieces.reserve(total_size);
+
+  for (const auto& piece : pieces) {
+    piece.AppendToString(&joined_pieces);
+  }
+  return joined_pieces;
+}
+}  // namespace
 
 // static
 void ShareServiceImpl::Create(blink::mojom::ShareServiceRequest request) {
   mojo::MakeStrongBinding(base::MakeUnique<ShareServiceImpl>(),
                           std::move(request));
 }
 
+// static
+bool ShareServiceImpl::ReplacePlaceholders(const std::string& url_template,
+                                           const std::string& title,
+                                           const std::string& text,
+                                           const GURL& share_url,
+                                           std::string* url_template_filled) {
+  constexpr char kTitlePlaceholder[] = "title";
+  constexpr char kTextPlaceholder[] = "text";
+  constexpr char kUrlPlaceholder[] = "url";
+
+  std::map<base::StringPiece, std::string> placeholder_to_data;
+  placeholder_to_data[kTitlePlaceholder] =
+      net::EscapeQueryParamValue(title, false);
+  placeholder_to_data[kTextPlaceholder] =
+      net::EscapeQueryParamValue(text, false);
+  placeholder_to_data[kUrlPlaceholder] =
+      net::EscapeQueryParamValue(share_url.spec(), false);
+
+  std::vector<base::StringPiece> split_template;
+  bool succeeded = SplitTemplate(url_template, &split_template);

[Sam McNally, 2017/01/10 06:53:50]

if (!SplitTemplate(...)) {
  return false;
}

[constantina, 2017/01/12 04:04:40]

Gone.

+  if (!succeeded) {
+    return false;
+  }
+
+  // Replace placeholders in |split_template| with share data.
+  for (size_t i = 1; i < split_template.size(); i += 2) {
+    base::StringPiece placeholder = split_template[i];
+    auto it = placeholder_to_data.find(placeholder);
+    if (it != placeholder_to_data.end()) {
+      split_template[i] = it->second;
+    } else {
+      split_template[i].clear();
+    }
+  }
+
+  *url_template_filled = JoinString(split_template);
+  return true;
+}
+
+void ShareServiceImpl::OpenTargetURL(const GURL& target_url) {
+  Browser* browser = BrowserList::GetInstance()->GetLastActive();
+  chrome::AddTabAt(browser, target_url,
+                   browser->tab_strip_model()->active_index() + 1, true);
+}
+
 void ShareServiceImpl::Share(const std::string& title,
                              const std::string& text,
-                             const GURL& url,
+                             const GURL& share_url,
                              const ShareCallback& callback) {
-  // TODO(constantina): Implement Web Share Target here.
-  NOTIMPLEMENTED();
-  callback.Run(base::Optional<std::string>("Not implemented: navigator.share"));
+  const char kUrlBase[] = "https://wicg.github.io/web-share-target/";

[Sam McNally, 2017/01/10 06:53:50]

constexpr

[constantina, 2017/01/12 04:04:41]

Done.

+  constexpr char kUrlTemplate[] =
+      "demos/sharetarget.html?title={title}&text={text}&url={url}";
+
+  std::string url_template_filled;
+  bool succeeded = ReplacePlaceholders(kUrlTemplate, title, text, share_url,

[Sam McNally, 2017/01/10 06:53:50]

if (!ReplacePlaceholders(...)) {

[constantina, 2017/01/12 04:04:41]

Done.

+                                       &url_template_filled);
+  if (!succeeded) {
+    callback.Run(base::Optional<std::string>(
+        "Error: unable to replace placeholders in url template"));
+    return;
+  }
+
+  GURL target_url(kUrlBase + url_template_filled);
+  if (!succeeded || !target_url.is_valid()) {
+    callback.Run(base::Optional<std::string>(
+        "Error: url of share target is not a valid url."));
+    return;
+  }
+  OpenTargetURL(target_url);
+
+  callback.Run(base::Optional<std::string>());
 }