Sharing on iOS

ios/OpenbookShareExtension/Base.lproj/MainInterface.storyboard

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+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="j1y-V4-xli">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Share View Controller-->
+        <scene sceneID="ceB-am-kn3">
+            <objects>
+                <viewController id="j1y-V4-xli" customClass="ShareViewController" customModuleProvider="" sceneMemberID="viewController">
+                    <view key="view" opaque="NO" contentMode="scaleToFill" id="wbc-yd-nQP">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="0.0" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="1Xd-am-t49"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="CEy-Cv-SGf" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

ios/OpenbookShareExtension/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Openbook</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>XPC!</string>
+	<key>CFBundleShortVersionString</key>
+	<string>0.0.34</string>
+	<key>CFBundleVersion</key>
+	<string>34</string>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionAttributes</key>
+		<dict>
+			<key>NSExtensionActivationRule</key>
+			<string>TRUEPREDICATE</string>
+		</dict>
+		<key>NSExtensionMainStoryboard</key>
+		<string>MainInterface</string>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.share-services</string>
+	</dict>
+</dict>
+</plist>

ios/OpenbookShareExtension/OpenbookShareExtension.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.social.openbook.app</string>
+		<string>group.social.openbook.app.onesignal</string>
+	</array>
+</dict>
+</plist>

ios/OpenbookShareExtension/ShareViewController.h

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+#import <UIKit/UIKit.h>
+#import <Social/Social.h>
+
+@interface ShareViewController : SLComposeServiceViewController
+
+@end

ios/OpenbookShareExtension/ShareViewController.m

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+#import "ShareViewController.h"
+
+const NSString* APP_GROUP_NAME = @"group.social.openbook.app";
+
+@interface ShareViewController ()
+
+@end
+
+@implementation ShareViewController
+
+- (BOOL)isContentValid {
+  // Do validation of contentText and/or NSExtensionContext attachments here
+  return YES;
+}
+
+- (NSString*)getTempDir {
+  NSFileManager* manager = [NSFileManager defaultManager];
+  NSString* tempDir = [[[manager containerURLForSecurityApplicationGroupIdentifier:APP_GROUP_NAME] path] stringByAppendingPathComponent:@"tmp"];
+
+  BOOL isDir;
+  NSError* error = nil;
+
+  if (![manager fileExistsAtPath:tempDir isDirectory:&isDir]) {
+    if (![manager createDirectoryAtPath:tempDir withIntermediateDirectories:YES attributes:nil error:&error]) {
+      // TODO: handle error
+    }
+  }
+
+  return tempDir;
+}
+
+- (NSString*) getTempFileWithExtension:(NSString*)extension {
+  NSString* fileName = [[NSUUID UUID] UUIDString];
+  NSString* tempFile = [fileName stringByAppendingPathExtension:extension];
+
+  return tempFile;
+}
+
+- (UIApplication*)getUIApplication {
+  UIResponder* responder = (UIResponder*)self;
+  while ((responder = [responder nextResponder]) != nil) {
+    if ([responder isKindOfClass:[UIApplication class]]) {
+      return (UIApplication*)responder;
+    }
+  }
+  return nil;
+}
+
+- (void)callOpenbookAppWithSharedFileName:(NSString*)fileName {
+  NSURL* url = [[NSURL URLWithString:@"openbook://share"] URLByAppendingPathComponent:fileName];
+  NSLog(@"Opening URL: %@", url);
+  UIApplication* application = [self getUIApplication];
+  if (application == nil) {
+    NSLog(@"Failed to get UIApplication, can't open URL!");
+    return;
+  }
+
+  [application performSelector:@selector(openURL:) withObject:url];
+}
+
+- (void)callOpenbookAppWithData:(NSDictionary*)data {
+  NSFileManager* manager = [NSFileManager defaultManager];
+  NSError* error;
+  NSData* jsonData = [NSJSONSerialization dataWithJSONObject:data options:0 error:&error];
+  // TODO: handle error
+  NSString* tempPath = [self getTempDir];
+  NSString* jsonFile = [self getTempFileWithExtension:@"json"];
+  if (![manager createFileAtPath:[tempPath stringByAppendingPathComponent:jsonFile] contents:jsonData attributes:nil]) {
+    // TODO: handle error
+  }
+  // call main app
+  [self callOpenbookAppWithSharedFileName:jsonFile];
+  // Inform the host that we're done, so it un-blocks its UI. Note: Alternatively you could call super's -didSelectPost, which will similarly complete the extension context.
+  [self.extensionContext completeRequestReturningItems:@[] completionHandler:nil];
+}
+
+- (void)didSelectPost {
+  // This is called after the user selects Post. Do the upload of contentText and/or NSExtensionContext attachments.
+  NSFileManager* manager = [NSFileManager defaultManager];
+  NSExtensionContext* context = self.extensionContext;
+  // As we have to communicate text and an image to the app, write everything to a file instead of putting everything in an URL.
+  NSMutableDictionary* args = [[NSMutableDictionary alloc] init];
+  args[@"text"] = self.contentText;
+  // Handle an image
+  BOOL hasCallback = NO;
+  NSArray* items = context.inputItems;
+  if ([items count] >= 1) {
+    NSExtensionItem* item = items[0];
+    if ([item.attachments count] >= 1) {
+      NSItemProvider* itemProvider = item.attachments[0];
+      if ([itemProvider hasItemConformingToTypeIdentifier:@"public.image"]) {
+        hasCallback = YES;
+        [itemProvider loadItemForTypeIdentifier:@"public.image" options:nil completionHandler:^void(UIImage* image, NSError* error) {
+          // TODO: handle error
+          NSData* imageData = UIImageJPEGRepresentation(image, 1.0);
+          if (imageData == nil){
+            // TODO: handle error
+          }
+          NSString* tempPath = [self getTempDir];
+          NSString* fileName = [self getTempFileWithExtension:@"jpg"];
+          if (![manager createFileAtPath:[tempPath stringByAppendingPathComponent:fileName] contents:imageData attributes:nil]) {
+            // TODO: handle error
+          }
+          args[@"path"] = [tempPath stringByAppendingPathComponent:fileName];
+          NSLog(@"image written to %@, opening app", args[@"path"]);
+          [self callOpenbookAppWithData:args];
+        }];
+      } else {
+        NSLog(@"No UTI public.image found, ignoring attachment");
+      }
+    }
+  }
+
+  // If we have a callback (when loading an image), do not immediately open the app, that will happen in the callback
+  if (!hasCallback) {
+    [self callOpenbookAppWithData:args];
+  }
+}
+
+- (NSArray *)configurationItems {
+  // To add configuration options via table cells at the bottom of the sheet, return an array of SLComposeSheetConfigurationItem here.
+  return @[];
+}
+
+@end