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react-native-webview
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feat(iOS): Add onFileDownload callback to help iOS apps implement file downloads. 

`onFileDownload` is called with the URL that you can use to download the file.
When RNCWebView detects that the HTTP response should result in a file download,
`onFileDownload` is called. The client can then provide code to download
the file.

RNCWebView determines that a file download should take place if either of the
following is true:
1. The HTTP response contains a `Content-Disposition` header that is of type
  'attachment'
2. The MIME type of the response cannot be rendered by the iOS WebView
Tyler Coffman 4 years ago
parent
b4cb16118b
commit
17bd1e5356
9 changed files with 131 additions and 11 deletions
Split View Show Diff Stats
  1. 14
    3
      docs/Guide.md
  2. 14
    0
      example/App.tsx
  3. 55
    0
      example/examples/Downloads.tsx
  4. 2
    2
      example/ios/Podfile.lock
  5. 1
    1
      index.d.ts
  6. 22
    5
      ios/RNCWebView.m
  7. 1
    0
      ios/RNCWebViewManager.m
  8. 1
    0
      src/WebView.ios.tsx
  9. 21
    0
      src/WebViewTypes.ts

+ 14
- 3
docs/Guide.md View File 

@@ -230,9 +230,19 @@ You can control **single** or **multiple** file selection by specifing the [`mul
230 230
231 231 
 ##### iOS
232 232
233 
-For iOS, all you need to do is specify the permissions in your `ios/[project]/Info.plist` file:
233 
+On iOS, you are going to have to supply your own code to download files. You can supply an `onFileDownload` callback
234 
+to the WebView component as a prop. If RNCWebView determines that a file download needs to take place, the URL where you can download the file
235 
+will be given to `onFileDownload`. From that callback you can then download that file however you would like to do so.
236 
+
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+Example:
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+```javascript
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+  onFileDownload = ({ nativeEvent }) => {
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+    const { downloadUrl } = nativeEvent;
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+    // --> Your download code goes here <--
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+  }
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+```
234 244
235 
-Save to gallery:
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+To be able to save images to the gallery you need to specify this permission in your `ios/[project]/Info.plist` file:
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237 247 
 ```
238 248 
 <key>NSPhotoLibraryAddUsageDescription</key>
 
@@ -241,7 +251,8 @@ Save to gallery:
241 251
242 252 
 ##### Android
243 253
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-Add permission in AndroidManifest.xml:
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+On Android, integration with the DownloadManager is built-in.
255 
+All you have to do to support downloads is add these permissions in AndroidManifest.xml:
245 256
246 257 
 ```xml
247 258 
 <manifest ...>

+ 14
- 0
example/App.tsx View File 

@@ -13,6 +13,7 @@ import {
13 13 
 import Alerts from './examples/Alerts';
14 14 
 import Scrolling from './examples/Scrolling';
15 15 
 import Background from './examples/Background';
16 
+import Downloads from './examples/Downloads';
16 17 
 import Uploads from './examples/Uploads';
17 18
18 19 
 const TESTS = {
 
@@ -40,6 +41,14 @@ const TESTS = {
40 41 
       return <Background />;
41 42 
     },
42 43 
   },
44 
+  Downloads: {
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+    title: 'Downloads',
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+    testId: 'downloads',
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+    description: 'File downloads test',
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+    render() {
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+      return <Downloads />;
50 
+    },
51 
+  },
43 52 
   Uploads: {
44 53 
     title: 'Uploads',
45 54 
     testId: 'uploads',
 
@@ -101,6 +110,11 @@ export default class App extends Component<Props, State> {
101 110 
             title="Background"
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             onPress={() => this._changeTest('Background')}
103 112 
           />
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+          {Platform.OS == "ios" && <Button
114 
+            testID="testType_downloads"
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+            title="Downloads"
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+            onPress={() => this._changeTest('Downloads')}
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+          />}
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           {Platform.OS === 'android' && <Button
105 119 
             testID="testType_uploads"
106 120 
             title="Uploads"

+ 55
- 0
example/examples/Downloads.tsx View File 

@@ -0,0 +1,55 @@
1 
+import React, {Component} from 'react';
2 
+import {Alert, Platform, View} from 'react-native';
3 
+
4 
+import WebView, {FileDownload} from '../..';
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+
6 
+const HTML = `
7 
+<!DOCTYPE html>\n
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+<html>
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+  <head>
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+    <title>Downloads</title>
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+    <meta http-equiv="content-type" content="text/html; charset=utf-8">
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+    <meta name="viewport" content="width=320, user-scalable=no">
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+    <style type="text/css">
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+      body {
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+        margin: 0;
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+        padding: 0;
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+        font: 62.5% arial, sans-serif;
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+        background: #ccc;
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+      }
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+    </style>
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+  </head>
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+  <body>
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+    <a href="https://www.7-zip.org/a/7za920.zip">Example zip file download</a>
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+  </body>
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+</html>
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+`;
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+
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+type Props = {};
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+type State = {};
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+
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+export default class Downloads extends Component<Props, State> {
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+  state = {};
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+
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+  onFileDownload = ({ nativeEvent }: { nativeEvent: FileDownload } ) => {
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+    Alert.alert("File download detected", nativeEvent.downloadUrl);
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+  };
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+
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+  render() {
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+    const platformProps = Platform.select({
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+      ios: {
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+        onFileDownload: this.onFileDownload,
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+      },
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+    });
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+
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+    return (
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+      <View style={{ height: 120 }}>
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+        <WebView
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+          source={{html: HTML}}
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+          automaticallyAdjustContentInsets={false}
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+          {...platformProps}
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+        />
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+      </View>
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+    );
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+  }
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+}

+ 2
- 2
example/ios/Podfile.lock View File 

@@ -182,7 +182,7 @@ PODS:
182 182 
     - React-cxxreact (= 0.61.5)
183 183 
     - React-jsi (= 0.61.5)
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   - React-jsinspector (0.61.5)
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-  - react-native-webview (8.0.6):
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+  - react-native-webview (8.1.0):
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     - React
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   - React-RCTActionSheet (0.61.5):
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     - React-Core/RCTActionSheetHeaders (= 0.61.5)
 
@@ -326,7 +326,7 @@ SPEC CHECKSUMS:
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   React-jsi: cb2cd74d7ccf4cffb071a46833613edc79cdf8f7
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   React-jsiexecutor: d5525f9ed5f782fdbacb64b9b01a43a9323d2386
328 328 
   React-jsinspector: fa0ecc501688c3c4c34f28834a76302233e29dc0
329 
-  react-native-webview: 222d83c9c489e09b5d3541519110a637490ad4fa
329 
+  react-native-webview: 88d83b4df2e792cfc36c952b1c496e2ac01cf0b8
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   React-RCTActionSheet: 600b4d10e3aea0913b5a92256d2719c0cdd26d76
331 331 
   React-RCTAnimation: 791a87558389c80908ed06cc5dfc5e7920dfa360
332 332 
   React-RCTBlob: d89293cc0236d9cb0933d85e430b0bbe81ad1d72

+ 1
- 1
index.d.ts View File 

@@ -2,7 +2,7 @@ import { Component } from 'react';
2 2 
 // eslint-disable-next-line
3 3 
 import { IOSWebViewProps, AndroidWebViewProps } from './lib/WebViewTypes';
4 4
5 
-export { WebViewMessageEvent, WebViewNavigation } from "./lib/WebViewTypes";
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+export { FileDownload, WebViewMessageEvent, WebViewNavigation } from "./lib/WebViewTypes";
6 6
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 export type WebViewProps = IOSWebViewProps & AndroidWebViewProps;
8 8

+ 22
- 5
ios/RNCWebView.m View File 

@@ -67,6 +67,8 @@ static NSDictionary* customCertificatesForHost;
67 67 
     UIScrollViewDelegate,
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 #endif // !TARGET_OS_OSX
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     RCTAutoInsetsProtocol>
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+
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+@property (nonatomic, copy) RCTDirectEventBlock onFileDownload;
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 @property (nonatomic, copy) RCTDirectEventBlock onLoadingStart;
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 @property (nonatomic, copy) RCTDirectEventBlock onLoadingFinish;
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 @property (nonatomic, copy) RCTDirectEventBlock onLoadingError;
 
@@ -1061,24 +1063,39 @@ static NSDictionary* customCertificatesForHost;
1061 1063 
   decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse
1062 1064 
                     decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
1063 1065 
 {
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+  WKNavigationResponsePolicy policy = WKNavigationResponsePolicyAllow;
1064 1067 
   if (_onHttpError && navigationResponse.forMainFrame) {
1065 1068 
     if ([navigationResponse.response isKindOfClass:[NSHTTPURLResponse class]]) {
1066 1069 
       NSHTTPURLResponse *response = (NSHTTPURLResponse *)navigationResponse.response;
1067 1070 
       NSInteger statusCode = response.statusCode;
1071 
+      NSString *disposition = [response valueForHTTPHeaderField:@"Content-Disposition"];
1068 1072
1069 1073 
       if (statusCode >= 400) {
1070 
-        NSMutableDictionary<NSString *, id> *event = [self baseEvent];
1071 
-        [event addEntriesFromDictionary: @{
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+        NSMutableDictionary<NSString *, id> *httpErrorEvent = [self baseEvent];
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+        [httpErrorEvent addEntriesFromDictionary: @{
1072 1076 
           @"url": response.URL.absoluteString,
1073 1077 
           @"statusCode": @(statusCode)
1074 1078 
         }];
1075 1079
1076 
-        _onHttpError(event);
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+        _onHttpError(httpErrorEvent);
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+      }
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+
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+      BOOL isAttachment = disposition != nil && [disposition hasPrefix:@"attachment"];
1084 
+      if (isAttachment || !navigationResponse.canShowMIMEType) {
1085 
+        if (_onFileDownload) {
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+          policy = WKNavigationResponsePolicyCancel;
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+
1088 
+          NSMutableDictionary<NSString *, id> *downloadEvent = [self baseEvent];
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+          [downloadEvent addEntriesFromDictionary: @{
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+            @"downloadUrl": (response.URL).absoluteString,
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+          }];
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+          _onFileDownload(downloadEvent);
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+        }
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       }
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     }
1079 
-  }
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+  }
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-  decisionHandler(WKNavigationResponsePolicyAllow);
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+  decisionHandler(policy);
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 }
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 /**

+ 1
- 0
ios/RNCWebViewManager.m View File 

@@ -34,6 +34,7 @@ RCT_EXPORT_MODULE()
34 34 
 }
35 35
36 36 
 RCT_EXPORT_VIEW_PROPERTY(source, NSDictionary)
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+RCT_EXPORT_VIEW_PROPERTY(onFileDownload, RCTDirectEventBlock)
37 38 
 RCT_EXPORT_VIEW_PROPERTY(onLoadingStart, RCTDirectEventBlock)
38 39 
 RCT_EXPORT_VIEW_PROPERTY(onLoadingFinish, RCTDirectEventBlock)
39 40 
 RCT_EXPORT_VIEW_PROPERTY(onLoadingError, RCTDirectEventBlock)

+ 1
- 0
src/WebView.ios.tsx View File 

@@ -338,6 +338,7 @@ class WebView extends React.Component<IOSWebViewProps, State> {
338 338 
         onLoadingError={this.onLoadingError}
339 339 
         onLoadingFinish={this.onLoadingFinish}
340 340 
         onLoadingProgress={this.onLoadingProgress}
341 
+        onFileDownload={this.props.onFileDownload}
341 342 
         onLoadingStart={this.onLoadingStart}
342 343 
         onHttpError={this.onHttpError}
343 344 
         onMessage={this.onMessage}

+ 21
- 0
src/WebViewTypes.ts View File 

@@ -104,6 +104,10 @@ export interface WebViewNavigation extends WebViewNativeEvent {
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   mainDocumentURL?: string;
105 105 
 }
106 106
107 
+export interface FileDownload {
108 
+  downloadUrl: string;
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+}
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+
107 111 
 export type DecelerationRateConstant = 'normal' | 'fast';
108 112
109 113 
 export interface WebViewMessage extends WebViewNativeEvent {
 
@@ -132,6 +136,8 @@ export type WebViewProgressEvent = NativeSyntheticEvent<
132 136
133 137 
 export type WebViewNavigationEvent = NativeSyntheticEvent<WebViewNavigation>;
134 138
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+export type FileDownloadEvent = NativeSyntheticEvent<FileDownload>;
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+
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 export type WebViewMessageEvent = NativeSyntheticEvent<WebViewMessage>;
136 142
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 export type WebViewErrorEvent = NativeSyntheticEvent<WebViewError>;
 
@@ -290,6 +296,7 @@ export interface IOSNativeWebViewProps extends CommonNativeWebViewProps {
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   scrollEnabled?: boolean;
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   useSharedProcessPool?: boolean;
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   onContentProcessDidTerminate?: (event: WebViewTerminatedEvent) => void;
299 
+  onFileDownload?: (event: FileDownloadEvent) => void;
293 300 
 }
294 301
295 302 
 export interface MacOSNativeWebViewProps extends CommonNativeWebViewProps {
 
@@ -482,6 +489,20 @@ export interface IOSWebViewProps extends WebViewSharedProps {
482 489 
    * @platform ios
483 490 
    */
484 491 
   onContentProcessDidTerminate?: (event: WebViewTerminatedEvent) => void;
492 
+
493 
+  /**
494 
+   * Function that is invoked when the client needs to download a file.
495 
+   * If the webview navigates to a URL that results in an HTTP response with a
496 
+   * Content-Disposition header 'attachment...', then this will be called.
497 
+   * If the MIME type indicates that the content is not renderable by the
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+   * webview, that will also cause this to be called.
499 
+   *
500 
+   * The application will need to provide its own code to actually download
501 
+   * the file.
502 
+   *
503 
+   * If not provided, the default is to let the webview try to render the file.
504 
+   */
505 
+  onFileDownload?: (event: FileDownloadEvent) => void;
485 506 
 }
486 507
487 508 
 export interface MacOSWebViewProps extends WebViewSharedProps {