Add multipart support to ios.

Author: wkh237

index.js

@@ -7,12 +7,20 @@ const fetch = (...args) => new Promise((resolve, reject) => {
 
   let [method, url, headers, body] = [...args]
 
-  RNFetchBlob.fetchBlob(method, url, headers, body, (err, data) => {
-    if(err)
-      reject(new Error(err, data))
-    else
-      resolve(new FetchBlobResponse(data))
-  })
+  if(Array.isArray(body))
+    RNFetchBlob.fetchBlobForm(method, url, headers, body, (err, data) => {
+      if(err)
+        reject(new Error(err, data))
+      else
+        resolve(new FetchBlobResponse(data))
+    })
+  else
+    RNFetchBlob.fetchBlob(method, url, headers, body, (err, data) => {
+      if(err)
+        reject(new Error(err, data))
+      else
+        resolve(new FetchBlobResponse(data))
+    })
 
 
 })

ios/RNFetchBlob/RNFetchBlob.h

@@ -11,6 +11,7 @@
 #import "RCTBridgeModule.h"
 
 @interface RNFetchBlob : NSObject <RCTBridgeModule>
+
 @end
 
 

ios/RNFetchBlob/RNFetchBlob.m

@@ -15,6 +15,90 @@ @implementation RNFetchBlob
 
 RCT_EXPORT_MODULE();
 
+// Fetch blob data request
+RCT_EXPORT_METHOD(fetchBlobForm:(NSString *)method url:(NSString *)url headers:(NSDictionary *)headers form:(NSArray *)form callback:(RCTResponseSenderBlock)callback)
+{
+    // send request
+    NSMutableURLRequest *request = [[NSMutableURLRequest alloc]
+                                    initWithURL:[NSURL
+                                                 URLWithString: url]];
+    
+    NSMutableDictionary *mheaders = [[NSMutableDictionary alloc] init];
+    
+    // make headers case insensitive
+    for(NSString * key in headers) {
+        [mheaders setValue:[headers valueForKey:key] forKey:[key lowercaseString]];
+    }
+    
+    NSTimeInterval timeStamp = [[NSDate date] timeIntervalSince1970];
+    NSNumber * timeStampObj = [NSNumber numberWithDouble: timeStamp];
+    
+    // generate boundary
+    NSString * boundary = [NSString stringWithFormat:@"RNFetchBlob%d", timeStampObj];
+    
+    // if method is POST or PUT, convert data string format
+    if([[method lowercaseString] isEqualToString:@"post"] || [[method lowercaseString] isEqualToString:@"put"]) {
+        NSMutableData * postData = [[NSMutableData alloc] init];
+        
+        // combine body
+        for(id field in form) {
+            NSString * name = [field valueForKey:@"name"];
+            NSString * content = [field valueForKey:@"data"];
+            // field is a text field
+            if([field valueForKey:@"filename"] == nil) {
+                [postData appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
+                [postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n", name] dataUsingEncoding:NSUTF8StringEncoding]];
+                [postData appendData:[[NSString stringWithFormat:@"Content-Type: text/plain\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
+                [postData appendData:[[NSString stringWithFormat:@"%@\r\n", content] dataUsingEncoding:NSUTF8StringEncoding]];
+            }
+            // field contains a file
+            else {
+                NSData* blobData = [[NSData alloc] initWithBase64EncodedString:content options:0];
+                NSString * filename = [field valueForKey:@"filename"];
+                [postData appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
+                [postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n", name, filename] dataUsingEncoding:NSUTF8StringEncoding]];
+                [postData appendData:[[NSString stringWithFormat:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
+                [postData appendData:blobData];
+                [postData appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
+            }
+            
+        }
+        // close form data
+        [postData appendData: [[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
+        [request setHTTPBody:postData];
+        // set content-length
+        [mheaders setValue:[NSString stringWithFormat:@"%d",[postData length]] forKey:@"Content-Length"];
+        [mheaders setValue:[NSString stringWithFormat:@"100-continue",[postData length]] forKey:@"Expect"];
+        // appaned boundary to content-type
+        [mheaders setValue:[NSString stringWithFormat:@"multipart/form-data; charset=utf-8; boundary=%@", boundary] forKey:@"content-type"];
+        
+    }
+    
+    [request setHTTPMethod: method];
+    [request setAllHTTPHeaderFields:mheaders];
+    
+    // create thread for http request
+    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
+    [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
+        
+        NSHTTPURLResponse* resp = (NSHTTPURLResponse *) response;
+        NSString* status = [NSString stringWithFormat:@"%d", resp.statusCode];
+        
+        if(connectionError)
+        {
+            callback(@[[connectionError localizedDescription], [NSNull null]]);
+        }
+        else if(![status isEqualToString:@"200"]) {
+            callback(@[status, [NSNull null]]);
+        }
+        else {
+            callback(@[[NSNull null], [data base64EncodedStringWithOptions:0]]);
+        }
+        
+    }];
+    
+}
+
 // Fetch blob data request
 RCT_EXPORT_METHOD(fetchBlob:(NSString *)method url:(NSString *)url headers:(NSDictionary *)headers body:(NSString *)body callback:(RCTResponseSenderBlock)callback)
 {
@@ -23,16 +107,26 @@ @implementation RNFetchBlob
                                     initWithURL:[NSURL
                                                  URLWithString: url]];
 
+    NSMutableDictionary *mheaders = [[NSMutableDictionary alloc] init];
+    
+    // make headers case insensitive
+    for(NSString * key in headers) {
+        [mheaders setValue:[headers valueForKey:key] forKey:[key lowercaseString]];
+    }
+
     // if method is POST or PUT, convert data string format
     if([[method lowercaseString] isEqualToString:@"post"] || [[method lowercaseString] isEqualToString:@"put"]) {
+        
         NSData* blobData = [[NSData alloc] initWithBase64EncodedString:body options:0];
         NSMutableData* postBody = [[NSMutableData alloc] init];
         [postBody appendData:[NSData dataWithData:blobData]];
         [request setHTTPBody:postBody];
+        [mheaders setValue:@"application/octet-stream" forKey:@"content-type"];
+        
     }
 
     [request setHTTPMethod: method];
-    [request setAllHTTPHeaderFields:headers];
+    [request setAllHTTPHeaderFields:mheaders];
 
     // create thread for http request
     NSOperationQueue *queue = [[NSOperationQueue alloc] init];
@@ -56,4 +150,5 @@ @implementation RNFetchBlob
 
 }
 
+
 @end