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OAuth 2.0 - IOS API V 2.0

Hello !

I use the the version API dropbox 1.0 for my app IOS, the new 2.0 is only swift and i can not use it because my app use only object-c.

So now i use API 1.0 for generate autentication DBSession restClient etc then use "https://api.dropboxapi.com/1/oauth2/token_from_oauth1" for access_token and call via HTTP the new api.dropboxapi.com/2.

This method works correctly, my question is, if this method is a good way to take advantage of the new API V2 ?

thanks

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Greg-DB

Yes, you can certainly use that endpoint to get an OAuth 2 access token and then use the HTTP interface for API v2.

Crypto C.

ok, thanks Gregory, another question if possible, i have problem with parameters for API v2, for example :

NSString *urlWithParams = @"https://api.dropboxapi.com/2/sharing/get_shared_links";

NSURL *url = [NSURL URLWithString:urlWithParams];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];

[request setHTTPMethod:@POST];

[request addValue:[appDelegate apiAuthorizationHeader] forHTTPHeaderField:@Authorization];

NSDictionary *parameters = @{@path: @};

NSMutableString *parameterString = [NSMutableString string];

for (NSString *key in [parameters allKeys]) {

if ([parameterString length]) {

[parameterString appendString:@&];

}

[parameterString appendFormat:@%@=%@", key, parameters[key]];

}

if (parameterString) [request setHTTPBody:[parameterString dataUsingEncoding:NSUTF8StringEncoding]];

NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data,

...

the problem is :

NSDictionary *parameters = @{@path: @};

NSMutableString *parameterString = [NSMutableString string];

for (NSString *key in [parameters allKeys]) {

if ([parameterString length]) {

[parameterString appendString:@&];

}

[parameterString appendFormat:@%@=%@", key, parameters[key]];

}

if (parameterString) [request setHTTPBody:[parameterString dataUsingEncoding:NSUTF8StringEncoding]];

the format is incorrect ... where is the problem ??

thanks

Greg-DB

It looks like you're form encoding the parameter(s) that you send in the body, but the API actually just expects JSON:

https://www.dropbox.com/developers/documentation/http#documentation-sharing-get_shared_links

For example, in this case, the data you send up should just be:

"{"path": "}"

Crypto C.

yes, mmm please, if possible, write small example in object-c ...

i have tested with :

...

NSString *urlWithParams = @"https://api.dropboxapi.com/2/sharing/get_shared_links";

NSURL *url = [NSURL URLWithString:urlWithParams];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];

[request setHTTPMethod:@POST];

[request addValue:[appDelegate apiAuthorizationHeader:2] forHTTPHeaderField:@Authorization];

NSDictionary *parameters = @{@path : @};

NSError *error;

NSData *postdata = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:&error];

[request setHTTPBody:postdata];

NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

but too error 400 ...

Greg-DB

What's the body of the error response? It should contain some more useful information.

Crypto C.

no this is httpResponse :

<NSHTTPURLResponse: 0x7fa7438723f0> { URL: https://api.dropboxapi.com/2/sharing/get_shared_links } { status code: 400, headers {

Connection = "keep-alive";

"Content-Type" = "text/plain; charset=utf-8";

Date = "Tue, 24 Nov 2015 19:15:03 GMT";

Server = nginx;

"Transfer-Encoding" = Identity;

"X-Dropbox-Request-Id" = 998c7ed7b7368bf59b7753ce5ae43308;

} }

Greg-DB

That only seems to be showing the status code and headers. What is the body of the response?

Crypto C.

Error in call to API function "sharing/get_shared_links": Bad HTTP "Content-Type" header: "application/x-www-form-urlencoded". Expecting one of "application/json", "application/json; charset=utf-8", "text/plain; charset=dropbox-cors-hack".

Greg-DB

That seems to be it then. The API expects a "Content-Type" header of "application/json", but your code apparently sends up "application/x-www-form-urlencoded". Change that to "application/json" and try again.

Crypto C.

ok,

add :

[request setValue:@application/json forHTTPHeaderField:@Content-Type];

and now it's ok ....

good work.

SGS E.

Hi, Could you please give some instruction how to get acessToken v2 from accessToken v1?

i know this API "https://api.dropboxapi.com/1/oauth2/token_from_oauth1 but dont know how to pass the parameters.

i'm using ios sdk

Crypto C.

Hi SGS E. none parameters is required, post

"https://api.dropboxapi.com/1/oauth2/token_from_oauth1" method "POST" with

Authorization OAuth 1.0 and return access_token OAuth 2.0

very easy.

bye

Greg-DB

That's correct, that endpoint requires OAuth 1 signing. This blog post, specifically step 4, may be helpful:

https://blogs.dropbox.com/developers/2012/07/using-oauth-1-0-with-the-plaintext-signature-method/

SGS E.

Hi,

I'm sorry but i still cant do it.

Now what i have is DBSession restClien or something like that.Is there anyway to get accesssToken v2 from resclient ?

Could you please give some sample code in your project ?

here is my code but it doesnt work well

MPOAuthCredentialConcreteStore* credential = [[DBSession sharedSession] credentialStoreForUserId:[info userId]];

AFHTTPSessionManager* manager = [[AFHTTPSessionManager alloc] initWithBaseURL:[NSURL URLWithString:BASE_URL]];

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

manager.requestSerializer = [AFHTTPRequestSerializer serializer];

[manager.requestSerializer setValue:@OAuth forHTTPHeaderField:@Authorization];

[manager.requestSerializer setValue:@1.0 forHTTPHeaderField:@oauth_version];

[manager.requestSerializer setValue:@PLAINTEXT forHTTPHeaderField:@oauth_signature_method];

[manager.requestSerializer setValue:APP_KEY_DB forHTTPHeaderField:@oauth_consumer_key];

[manager.requestSerializer setValue:credential.accessToken forHTTPHeaderField:@oauth_token];

[manager.requestSerializer setValue:[NSString stringWithFormat:@%@&%@",credential.requestTokenSecret,credential.accessTokenSecret] forHTTPHeaderField:@oauth_signature];

[manager POST:@"https://api.dropboxapi.com/1/oauth2/token_from_oauth1" parameters:@{} success:^(NSURLSessionDataTask *task, id responseObject) {

} failure:^(NSURLSessionDataTask *task, NSError *error) {

}];

//It show error

Code=-1011 "Request failed: bad request (400)"

Greg-DB

I don't believe we have any sample code for this specifically in Objective-C unfortunately.

Looking at your code, it seems you are setting all of the OAuth parameters as individual parameters, when they should just be together in the one "Authorization" header, as shown in the blog post I linked to.

SGS E.

yah, you are right , after change the OAuth parameters as the one it works like a charm !

Thank you very much.

btw,dropbox sdk is great but the ios' sdk and its document is quite out of date