Dropbox generate Auth Token thru java

Question

Hi,
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I am able to generate Access Token manually thru the dropbox website which is working fine. But expires after a few hours,&nbsp;Is there any method in Java that can generate access token programmatically? I would like to test this out so that we can start doing uploads and downloads by generating access tokens.
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DB-Des · Answer

Hi Jagan Tirumalai,
&nbsp;
Even though Dropbox issues short-lived access tokens,&nbsp;apps can get long-term access by requesting "offline" access, in which case the app receives a "refresh token" that can be used to retrieve new short-lived access tokens as needed, without further manual user intervention. Refresh tokens do not expire automatically and can be used repeatedly. You can find more information in the OAuth Guide and authorization documentation. There's a basic outline of processing this flow in this blog post which may serve as a useful example.
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For your use case, working with refresh tokens would be easier with our official Java SDK. Helper methods accept the refresh token, and manage this update of the short-lived access token for you.
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I hope you find this information helpful!

Jagan Tirumalai · Answer

Thank you very much for your response. I have generated an access code from oauth2. Its asking me to enter this code into CLIENTSDATA (which is the app i created in dropbox). I don't know where to enter this Access Code in ClientsData. Given below are the screenshots of the access code from OAUTH2 and ClientsData settings/permissions. Where do i enter this access code in ClientsData settings/permissions?

Spoiler

Greg-DB · Answer

Jagan Tirumalai That "access code" is also known as the "authorization code". It should not be copied into the app's settings on the App Console; it should be copied back into the app itself. For example, refer to this line in the Java SDK example code that reads the authorization code back into the app so it can then finish the authorization flow.

Jagan Tirumalai · Answer

Hi Greg-DB&nbsp;I have tried executing with ScopeAuthorize.java in my java program. When running the script its asking me to use&nbsp;DbxPKCEWebAuth instead of&nbsp;DbxWebAuth. So i have modified the code in ScopeAuthorize.java (local version) with&nbsp;DbxPKCEWebAuth. After changing with&nbsp;DbxPKCEWebAuth i am getting the following error when validating the access code.&nbsp;&nbsp;Debug Stmts from ScopeAuthorize.javaAfter authorize methodInside authorize methodin Oauth2 flow11. Go to https://www.dropbox.com/oauth2/authorize?token_access_type=online&amp;scope=account_info.read&amp;response_type=code&amp;code_challenge_method=S256&amp;client_id=4861qitn5qrgn07&amp;code_challenge=V3LyeT-FoG7CgSw0f_h8qpmfEhu4q9JXchcMSVq4cro2. Click "Allow" (you might have to log in first).3. Copy the authorization code.Enter the authorization code here: 5dT79_yz4OAAAAAAAAACesA41RjYlsBmJaj9cl8HDkIAfter code.trim :5dT79_yz4OAAAAAAAAACesA41RjYlsBmJaj9cl8HDkIBefore finishfromcodeError in DbxWebAuth.authorize: {"error": "invalid_grant", "error_description": "invalid code verifier"}&nbsp;I am not able to attach my java program and ScopeAuthorize.java (with my changes) to this forum.&nbsp;ScopeAuthorize.java is failing at line 133 which is given below.DbxAuthFinish authFinish = webAuth.finishFromCode(code);&nbsp; Line 133&nbsp;which i have changed it to the following (note PKCEwebAuth instead of webAuth).System.out.println("Before finishfromcode"); --&gt; its working up to this pointDbxAuthFinish authFinish = PKCEwebAuth.finishFromCode(code); --&gt; its failing hereSystem.out.println("After finishfromcode");

DB-Des · Answer

Hi&nbsp;Jagan Tirumalai,
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Based on the Auth URL you have provided, it looks like you are following a PKCE auth flow, which would explain why the suggestion to use&nbsp;DbxPKCEWebAuth is being made.
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If the intention is to use PKCE, we would recommend taking a look at this example instead.

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Dropbox generate Auth Token thru java

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