How do I upload a file to my dropbox apps folder in dropbox in objective c?

[Chez B.]

Currently nothing happens when I run my code.

This is how I am setting the up client. I did not put the client set up in my viewDidLoad method because this class will never be shown it just handles server side actions.

(instancetype)initWithClient  
{

  self = [super init];

  if (self) {

    self.restClient = [[DBRestClient alloc] initWithSession:[DBSession sharedSession]];

    self.restClient.delegate = self;

      }

  return self;  
}  

This is how I make the API call to upload

(void)uploadToDropBox:(UIImage *)img  
{

  NSLog(@"Entered the DB upload method");


  NSArray *directories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  
                                                             NSUserDomainMask,  
                                                             YES);


  NSString *documentDirectory = [directories firstObject];

  NSString *imagePath = [documentDirectory stringByAppendingPathComponent:@"cardImage"];

  NSString *destDir = @"Apps/BirthdayScrapbook";

  NSLog(@"Just about to execute the upload method");

  NSData *imageData = UIImagePNGRepresentation(img);

  [imageData writeToFile:imagePath atomically: YES];

  [self.restClient uploadFile:@"cardImage" toPath:destDir withParentRev:nil fromPath:imagePath];

  NSLog(@"Executed the DB  upload method");

  [self sendBDayCard];  
}  

I think I am going about it wrong. I know what my access token is, but I don't know what to do with it nor where to put it. There is a client init method that takes in the userID, but I don't know where to find my accounts userID. Can someone give some direction with this?

[Rich]

Moved to the API forum.

[Greg-DB]

There are a few things to note here:

1) Did you implement the callback methods?

- (void)restClient:(DBRestClient*)client uploadedFile:(NSString*)destPath from:(NSString*)srcPath metadata:(DBMetadata*)metadata;  
- (void)restClient:(DBRestClient*)client uploadFileFailedWithError:(NSError*)error;

 That's how you receive the requested information back.

2) You don't need to explicitly specify your app folder as "Apps/BirthdayScrapbook". App folder apps are implicitly rooted in their app folder, so you can just use "/".

3) Normally with the iOS or OS X Core SDK, you don't need to supply the access token manually. It's programmatically retrieved using the built-in app authorization flow, as shown in the tutorial:

https://www.dropbox.com/developers/core/start/ios

If you do have an access token you want to set manually though you can use this method on DBSession :

- (void)updateAccessToken:(NSString *)token accessTokenSecret:(NSString *)secret forUserId:(NSString *)userId;

The userId is the integer user ID for your account, e.g., as seen in DBSession.userIds , or as returned by the /account/info endpoint, which is loadAccountInfo ( loadedAccountInfo and loadAccountInfoFailedWithError callbacks) in the Core SDK.

[Chez B.]

I have the call back methods implemented in the same class like so.

(void)restClient:(DBRestClient *)client uploadedFile:(NSString *)destPath from:(NSString *)srcPath metadata:(DBMetadata *)metadata {
    NSLog(@"File uploaded successfully to path: %@", metadata.path);
}

 (void)restClient:(DBRestClient *)client uploadFileFailedWithError:(NSError *)error {
    NSLog(@"File upload failed with error: %@", error);  
}  

Though I have not called them anywhere in the program. I suppose that may not be necessary.

I tried to add the updateAcessToken method inside my didFinishLaunching method like this. I have my actual app key and app secret in my actual code. I just omitted them for security.

DBSession *dbSession = [[DBSession alloc]
                        initWithAppKey:@"db-myAppKey"
                        appSecret:@"myAppSecret"
                        root:kDBRootAppFolder]; // either kDBRootAppFolder or kDBRootDropbox

 [dbSession updateAccessToken:@"myAccessToken" accessTokenSecret:@"MyAppsAppSecret" forUserId:[[DBAccountInfo alloc] init].userId];

[DBSession setSharedSession:dbSession];  

Xcode gives me the error:

setObjectForKey: key cannot be nil

userID is nil which makes sense. How do I obtain the user ID that is associated with the account that my app was created on without having to bring up a formal dropbox login view when I run the app? I want to be logged into the account that my app was created on, and obtain the userID all in the back end. I don't want the user of the app to have any knowledge that this is going on.

[Greg-DB]

Thanks. That's correct, you don't have to call the callback methods yourself, they get called by the SDK.

Also, note that the app key passed to initWithAppKey should be just the app key, without the "db-" prefix. The "db-" prefix is only necessary for the URL scheme you register in the plist.

Finally, yes, as you mentioned this error is expected as you're just initializing an empty DBAccount object, so the userId isn't set. 

Normally, you don't need to know the user ID to start with, as the user authorizes the account, and doesn't supply an access token themselves. It is possible to use API/SDK like this with a single account, but it isn't recommended, for a variety of security and technical reasons.

If you do go this route though, you'll need to get the user ID for your account once, just like you got an access token for your account once. You can do this by calling the /account/info endpoint manually once. This blog post covers how to make these calls with OAuth 1 manually if you need.

[Chez B.]

I am only using the API/SDK with one user account because I am working on app that is not going to be published. I am interning a Facebook and I am in a program where the focus is to teach us mobile development. This app is a learning experience. I just need an easy way to store videos that can be accessed by whoever we email the dropbox link to. 

Since I am working in objective c how do I call the method /account/info endpoint?

Is there a method in the iOS SDK that makes calling those types of methods possible?

[Greg-DB]

Yes, the loadAccountInfo method makes that API call, but you need to be linked to do that first anyway. 

To get your user ID once, you can make the call once, e.g.:

curl "https://api.dropbox.com/1/account/info?oauth_version=1.0&oauth_signature_method=PLAINTEXT&oauth_nonce=NONCE_HERE&oauth_consumer_key=APP_KEY_HERE&oauth_token=ACCESS_TOKEN_KEY_HERE&oauth_timestamp=CURRENT_TIMESTAMP_HERE&oauth_signature=APP_SECRET_HERE%26ACCESS_TOKEN_SECRET_HERE"

[Chez B.]

I ran this though my terminal while in the directory of where my app is located

curl "https://api.dropbox.com/1/account/info?oauth\_version=1.0&oauth\_signature\_method=PLAINTEXT&oauth\_..."

and this happened

<!DOCTYPE html>

<html>

<head><title>Dropbox - 4xx</title>

<link href="//www.dropbox.com/static/css/error.css" rel="stylesheet" type="text/css"/>

<link rel="shortcut icon" href="//www.dropbox.com/static/images/favicon.ico"/>

</head>

<body>

<div class="figure">

<img src="//www.dropbox.com/static/images/psychobox.png" alt="Error: 4xx"/>

</div>

<div id="errorbox">

<h1>Error (4xx)</h1>We can't find the page you're looking for. Check out our <a href="https://www.dropbox.com/help">Help Center</a> and <a href="https://forums.dropbox.com">forums</a> for help, or head back to <a href="https://www.dropbox.com/home">home</a>.

</div>

<script type="text/javascript" src="//www.dropbox.com/static/javascript/external/prototype.js"></script>

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[Greg-DB]

The forum formatting may have messed this up, but make sure you don't have any "\"s. 

Also, make sure you properly replaced all of the *_HERE values from my sample.

[Chez B.]

What does NONCE refer to and do I just supply a bash function for the timestamp portion?

In addition, is there a reason why I am not receiving the callbacks log messages? I have not seen one yet.