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getSignedURL() in Google Cloud Function produces link that works for several days, then returns “SignatureDoesNotMatch”

Get Download URL from file uploaded with Cloud Functions for FirebaseCloud Storage download URLs fail after three days, maybe due to Content-Type?Google Cloud signed Url +SignatureDoesNotMatchissues deleting an image using Cloud Functions for Firebase and @google-cloud/storageGet shorter file URL from Google Cloud Storage (with Firebase Cloud Functions)SignatureDoesNotMatch Google Cloud Storagefirebase / google cloud storage getFiles works fine but .upload or .file do notGoogle Cloud Functions bucket.upload()S3 upload from browser with presigned URL and SSE-C - 307 and 403sRead from Firebase/Google Cloud Storage as a Buffer in Node.js functionGoogle Cloud Cloud Function signed url yields 403 SignatureDoesNotMatchCors Error When Using Google Cloud Storage getSignedUrl Put Axios

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

0

My Firebase Storage getSignedUrl() download links work for a few days, then stop working. The error message is

SignatureDoesNotMatch
The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.

Last summer there was a long discussion of this on GitHub but I don't see that a solution was reached.

I'm thinking of using getDownloadURL() from the front end instead of using getSignedUrl() from the back end. Is getDownloadURL() less secure then getSignedUrl()?

Here's my code, which is mostly copied from the documentation:

let audioType = 'mp3';
const Storage = require('@google-cloud/storage');
const storage = new Storage();
const bucket = storage.bucket('my-app.appspot.com');
var file = bucket.file('Audio/' + longLanguage + '/' + pronunciation + '/' + wordFileType);

 // Firebase Storage file options
 var options = 
 metadata: 
 contentType: 'audio/' + audioType,
 metadata: 
 audioType: audioType,
 longAccent: 'United_States',
 shortAccent: 'US',
 longLanguage: 'English',
 shortLanguage: 'en',
 source: 'Oxford Dictionaries',
 word: word
 
 
 ;

 const config = 
 action: 'read',
 expires: '03-17-2025',
 content_type: 'audio/mp3'
 ;

 function oedPromise() 
 return new Promise(function(resolve, reject) 
 http.get(oedAudioURL, function(response) 
 response.pipe(file.createWriteStream(options))
 .on('error', function(error) 
 console.error(error);
 reject(error);
 )
 .on('finish', function() 
 file.getSignedUrl(config, function(err, url) 
 if (err) 
 console.error(err);
 return;
 else 
 resolve(url)
 
 );
 );
 );
 );
 

node.js firebase google-cloud-storage firebase-storage

share|improve this question

edited Mar 28 at 12:40

Dennis Alund

1,13011 gold badge55 silver badges1919 bronze badges

asked Mar 27 at 23:32

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you tried using an explicit service account? The bug you link to lists it as a solution.
  
  – Brandon Yarbrough
  Mar 28 at 20:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, I have serviceAccount set to a local json file, and then admin.initializeApp calls the serviceAccount. I call admin.firestore and admin.auth, but I never call admin.storage, as you can see in the above code. Instead I do "const storage = new Storage();", coped from the Google documentation. Maybe I should use admin.storage instead of "new Storage()"? It's not clear to me where "new Storage()" gets a service account from.
  
  – Thomas David Kehoe
  Mar 28 at 21:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  OK, I've switched from "const storage = new Storage();" to "const storage = admin.storage();". It works, ask me in a month whether the signed download URLs still work! And this morning I refactored my front end to use getDownloadURL() instead of relying on the back end to provide signed URLs. From reading the discussion on GitHub it sounds like signed URLs were intended for short-term use. The "v4" version can't have an expiration date beyond one week! And Google rotates service keys every week. I prefer signed URLs, as getDownloadURL() added hundreds of lines of complex code to my app.
  
  – Thomas David Kehoe
  Mar 28 at 22:09
  

  
  
  
  

add a comment | 

0

My Firebase Storage getSignedUrl() download links work for a few days, then stop working. The error message is

SignatureDoesNotMatch
The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.

Last summer there was a long discussion of this on GitHub but I don't see that a solution was reached.

I'm thinking of using getDownloadURL() from the front end instead of using getSignedUrl() from the back end. Is getDownloadURL() less secure then getSignedUrl()?

Here's my code, which is mostly copied from the documentation:

let audioType = 'mp3';
const Storage = require('@google-cloud/storage');
const storage = new Storage();
const bucket = storage.bucket('my-app.appspot.com');
var file = bucket.file('Audio/' + longLanguage + '/' + pronunciation + '/' + wordFileType);

 // Firebase Storage file options
 var options = 
 metadata: 
 contentType: 'audio/' + audioType,
 metadata: 
 audioType: audioType,
 longAccent: 'United_States',
 shortAccent: 'US',
 longLanguage: 'English',
 shortLanguage: 'en',
 source: 'Oxford Dictionaries',
 word: word
 
 
 ;

 const config = 
 action: 'read',
 expires: '03-17-2025',
 content_type: 'audio/mp3'
 ;

 function oedPromise() 
 return new Promise(function(resolve, reject) 
 http.get(oedAudioURL, function(response) 
 response.pipe(file.createWriteStream(options))
 .on('error', function(error) 
 console.error(error);
 reject(error);
 )
 .on('finish', function() 
 file.getSignedUrl(config, function(err, url) 
 if (err) 
 console.error(err);
 return;
 else 
 resolve(url)
 
 );
 );
 );
 );
 

node.js firebase google-cloud-storage firebase-storage

share|improve this question

edited Mar 28 at 12:40

Dennis Alund

1,13011 gold badge55 silver badges1919 bronze badges

asked Mar 27 at 23:32

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you tried using an explicit service account? The bug you link to lists it as a solution.
  
  – Brandon Yarbrough
  Mar 28 at 20:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, I have serviceAccount set to a local json file, and then admin.initializeApp calls the serviceAccount. I call admin.firestore and admin.auth, but I never call admin.storage, as you can see in the above code. Instead I do "const storage = new Storage();", coped from the Google documentation. Maybe I should use admin.storage instead of "new Storage()"? It's not clear to me where "new Storage()" gets a service account from.
  
  – Thomas David Kehoe
  Mar 28 at 21:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  OK, I've switched from "const storage = new Storage();" to "const storage = admin.storage();". It works, ask me in a month whether the signed download URLs still work! And this morning I refactored my front end to use getDownloadURL() instead of relying on the back end to provide signed URLs. From reading the discussion on GitHub it sounds like signed URLs were intended for short-term use. The "v4" version can't have an expiration date beyond one week! And Google rotates service keys every week. I prefer signed URLs, as getDownloadURL() added hundreds of lines of complex code to my app.
  
  – Thomas David Kehoe
  Mar 28 at 22:09
  

  
  
  
  

add a comment | 

My Firebase Storage getSignedUrl() download links work for a few days, then stop working. The error message is

SignatureDoesNotMatch
The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.

Last summer there was a long discussion of this on GitHub but I don't see that a solution was reached.

I'm thinking of using getDownloadURL() from the front end instead of using getSignedUrl() from the back end. Is getDownloadURL() less secure then getSignedUrl()?

Here's my code, which is mostly copied from the documentation:

let audioType = 'mp3';
const Storage = require('@google-cloud/storage');
const storage = new Storage();
const bucket = storage.bucket('my-app.appspot.com');
var file = bucket.file('Audio/' + longLanguage + '/' + pronunciation + '/' + wordFileType);

 // Firebase Storage file options
 var options = 
 metadata: 
 contentType: 'audio/' + audioType,
 metadata: 
 audioType: audioType,
 longAccent: 'United_States',
 shortAccent: 'US',
 longLanguage: 'English',
 shortLanguage: 'en',
 source: 'Oxford Dictionaries',
 word: word
 
 
 ;

 const config = 
 action: 'read',
 expires: '03-17-2025',
 content_type: 'audio/mp3'
 ;

 function oedPromise() 
 return new Promise(function(resolve, reject) 
 http.get(oedAudioURL, function(response) 
 response.pipe(file.createWriteStream(options))
 .on('error', function(error) 
 console.error(error);
 reject(error);
 )
 .on('finish', function() 
 file.getSignedUrl(config, function(err, url) 
 if (err) 
 console.error(err);
 return;
 else 
 resolve(url)
 
 );
 );
 );
 );
 

node.js firebase google-cloud-storage firebase-storage

share|improve this question

edited Mar 28 at 12:40

Dennis Alund

1,13011 gold badge55 silver badges1919 bronze badges

asked Mar 27 at 23:32

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

SignatureDoesNotMatch
The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.

let audioType = 'mp3';
const Storage = require('@google-cloud/storage');
const storage = new Storage();
const bucket = storage.bucket('my-app.appspot.com');
var file = bucket.file('Audio/' + longLanguage + '/' + pronunciation + '/' + wordFileType);

 // Firebase Storage file options
 var options = 
 metadata: 
 contentType: 'audio/' + audioType,
 metadata: 
 audioType: audioType,
 longAccent: 'United_States',
 shortAccent: 'US',
 longLanguage: 'English',
 shortLanguage: 'en',
 source: 'Oxford Dictionaries',
 word: word
 
 
 ;

 const config = 
 action: 'read',
 expires: '03-17-2025',
 content_type: 'audio/mp3'
 ;

 function oedPromise() 
 return new Promise(function(resolve, reject) 
 http.get(oedAudioURL, function(response) 
 response.pipe(file.createWriteStream(options))
 .on('error', function(error) 
 console.error(error);
 reject(error);
 )
 .on('finish', function() 
 file.getSignedUrl(config, function(err, url) 
 if (err) 
 console.error(err);
 return;
 else 
 resolve(url)
 
 );
 );
 );
 );
 

share|improve this question

edited Mar 28 at 12:40

Dennis Alund

1,13011 gold badge55 silver badges1919 bronze badges

asked Mar 27 at 23:32

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

share|improve this question

edited Mar 28 at 12:40

Dennis Alund

1,13011 gold badge55 silver badges1919 bronze badges

asked Mar 27 at 23:32

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

edited Mar 28 at 12:40

Dennis Alund

1,13011 gold badge55 silver badges1919 bronze badges

edited Mar 28 at 12:40

Dennis Alund

1,13011 gold badge55 silver badges1919 bronze badges

asked Mar 27 at 23:32

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

asked Mar 27 at 23:32

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

2 Answers
2

active

oldest

votes

1

The maximum duration of a Google Cloud Storage Signed URL is 7 days. But it can also be shorter. Never longer. I guess the Firebase Storage has the same limit.

share|improve this answer

answered Apr 7 at 20:22

Peter FortuinPeter Fortuin

2,13166 gold badges3030 silver badges6060 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I hesitate to give you the green check mark because it's not the answer I want, but there's every reason to believe you. The documentation (cloud.google.com/nodejs/docs/reference/storage/2.3.x/…) says that "expires" is "A timestamp when this link will expire," without saying anything about a seven day limit. The documentation examples have "expires: '03-17-2025'", implying that you can set the expiration date years in the future. But not matter what I do the download URLs expire in seven days.
  
  – Thomas David Kehoe
  Apr 24 at 16:36
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Is there any way to get a permanent download URL from a Google Cloud Function? I know how to use getDownloadURL() from the browser, but I can't get it to work in a Cloud Function. getDownloadURL() isn't a Node function. It seems odd to me that I can get a permanent download URL from the browser and a temporary download URL from the Cloud Function. Shouldn't it be the other way around? Browsers are transitory, no one will keep their browser open for a week. But when I upload files from a Cloud Function it's permanent, and the download URL should be permanent,
  
  – Thomas David Kehoe
  Apr 24 at 19:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you enable public access on your object in Cloud Storage, you can use a direct URL to that object. Everybody with that URL can download the object.
  
  – Peter Fortuin
  Apr 30 at 14:45
  

  
  
  
  

add a comment | 

0

I've written a long answer to this question: [Get Download URL from file uploaded with Cloud Functions for Firebase. This question can be marked as a duplicate.

 [1]: https://stackoverflow.com/questions/42956250/get-download-url-from-file-uploaded-with-cloud-functions-for-firebase

share|improve this answer

edited Jul 8 at 18:07

answered Apr 13 at 1:16

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ten days later the signed download URLs are dead. Problem not solved!
  
  – Thomas David Kehoe
  Apr 24 at 16:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thomas David Kehoe - did you ever find a solution to this? This problem has been driving me nuts for a very long time.
  
  – barrylachapelle
  Jul 3 at 13:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @barrylachapelle, I wrote a long answer here: stackoverflow.com/questions/42956250/… I'm testing another idea someone suggested (using uuidv2 instead of uuidv4), ask me in a week if this worked!
  
  – Thomas David Kehoe
  Jul 8 at 18:04
  

  
  
  
  

add a comment | 

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1

The maximum duration of a Google Cloud Storage Signed URL is 7 days. But it can also be shorter. Never longer. I guess the Firebase Storage has the same limit.

share|improve this answer

answered Apr 7 at 20:22

Peter FortuinPeter Fortuin

2,13166 gold badges3030 silver badges6060 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I hesitate to give you the green check mark because it's not the answer I want, but there's every reason to believe you. The documentation (cloud.google.com/nodejs/docs/reference/storage/2.3.x/…) says that "expires" is "A timestamp when this link will expire," without saying anything about a seven day limit. The documentation examples have "expires: '03-17-2025'", implying that you can set the expiration date years in the future. But not matter what I do the download URLs expire in seven days.
  
  – Thomas David Kehoe
  Apr 24 at 16:36
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Is there any way to get a permanent download URL from a Google Cloud Function? I know how to use getDownloadURL() from the browser, but I can't get it to work in a Cloud Function. getDownloadURL() isn't a Node function. It seems odd to me that I can get a permanent download URL from the browser and a temporary download URL from the Cloud Function. Shouldn't it be the other way around? Browsers are transitory, no one will keep their browser open for a week. But when I upload files from a Cloud Function it's permanent, and the download URL should be permanent,
  
  – Thomas David Kehoe
  Apr 24 at 19:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you enable public access on your object in Cloud Storage, you can use a direct URL to that object. Everybody with that URL can download the object.
  
  – Peter Fortuin
  Apr 30 at 14:45
  

  
  
  
  

add a comment | 

1

The maximum duration of a Google Cloud Storage Signed URL is 7 days. But it can also be shorter. Never longer. I guess the Firebase Storage has the same limit.

share|improve this answer

answered Apr 7 at 20:22

Peter FortuinPeter Fortuin

2,13166 gold badges3030 silver badges6060 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I hesitate to give you the green check mark because it's not the answer I want, but there's every reason to believe you. The documentation (cloud.google.com/nodejs/docs/reference/storage/2.3.x/…) says that "expires" is "A timestamp when this link will expire," without saying anything about a seven day limit. The documentation examples have "expires: '03-17-2025'", implying that you can set the expiration date years in the future. But not matter what I do the download URLs expire in seven days.
  
  – Thomas David Kehoe
  Apr 24 at 16:36
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Is there any way to get a permanent download URL from a Google Cloud Function? I know how to use getDownloadURL() from the browser, but I can't get it to work in a Cloud Function. getDownloadURL() isn't a Node function. It seems odd to me that I can get a permanent download URL from the browser and a temporary download URL from the Cloud Function. Shouldn't it be the other way around? Browsers are transitory, no one will keep their browser open for a week. But when I upload files from a Cloud Function it's permanent, and the download URL should be permanent,
  
  – Thomas David Kehoe
  Apr 24 at 19:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you enable public access on your object in Cloud Storage, you can use a direct URL to that object. Everybody with that URL can download the object.
  
  – Peter Fortuin
  Apr 30 at 14:45
  

  
  
  
  

add a comment | 

The maximum duration of a Google Cloud Storage Signed URL is 7 days. But it can also be shorter. Never longer. I guess the Firebase Storage has the same limit.

share|improve this answer

answered Apr 7 at 20:22

Peter FortuinPeter Fortuin

2,13166 gold badges3030 silver badges6060 bronze badges

share|improve this answer

answered Apr 7 at 20:22

Peter FortuinPeter Fortuin

2,13166 gold badges3030 silver badges6060 bronze badges

answered Apr 7 at 20:22

Peter FortuinPeter Fortuin

2,13166 gold badges3030 silver badges6060 bronze badges

answered Apr 7 at 20:22

Peter FortuinPeter Fortuin

2,13166 gold badges3030 silver badges6060 bronze badges

0

I've written a long answer to this question: [Get Download URL from file uploaded with Cloud Functions for Firebase. This question can be marked as a duplicate.

 [1]: https://stackoverflow.com/questions/42956250/get-download-url-from-file-uploaded-with-cloud-functions-for-firebase

share|improve this answer

edited Jul 8 at 18:07

answered Apr 13 at 1:16

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ten days later the signed download URLs are dead. Problem not solved!
  
  – Thomas David Kehoe
  Apr 24 at 16:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thomas David Kehoe - did you ever find a solution to this? This problem has been driving me nuts for a very long time.
  
  – barrylachapelle
  Jul 3 at 13:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @barrylachapelle, I wrote a long answer here: stackoverflow.com/questions/42956250/… I'm testing another idea someone suggested (using uuidv2 instead of uuidv4), ask me in a week if this worked!
  
  – Thomas David Kehoe
  Jul 8 at 18:04
  

  
  
  
  

add a comment | 

0

I've written a long answer to this question: [Get Download URL from file uploaded with Cloud Functions for Firebase. This question can be marked as a duplicate.

 [1]: https://stackoverflow.com/questions/42956250/get-download-url-from-file-uploaded-with-cloud-functions-for-firebase

share|improve this answer

edited Jul 8 at 18:07

answered Apr 13 at 1:16

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ten days later the signed download URLs are dead. Problem not solved!
  
  – Thomas David Kehoe
  Apr 24 at 16:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thomas David Kehoe - did you ever find a solution to this? This problem has been driving me nuts for a very long time.
  
  – barrylachapelle
  Jul 3 at 13:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @barrylachapelle, I wrote a long answer here: stackoverflow.com/questions/42956250/… I'm testing another idea someone suggested (using uuidv2 instead of uuidv4), ask me in a week if this worked!
  
  – Thomas David Kehoe
  Jul 8 at 18:04
  

  
  
  
  

add a comment | 

I've written a long answer to this question: [Get Download URL from file uploaded with Cloud Functions for Firebase. This question can be marked as a duplicate.

 [1]: https://stackoverflow.com/questions/42956250/get-download-url-from-file-uploaded-with-cloud-functions-for-firebase

share|improve this answer

edited Jul 8 at 18:07

answered Apr 13 at 1:16

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

 [1]: https://stackoverflow.com/questions/42956250/get-download-url-from-file-uploaded-with-cloud-functions-for-firebase

share|improve this answer

edited Jul 8 at 18:07

answered Apr 13 at 1:16

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

answered Apr 13 at 1:16

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges

answered Apr 13 at 1:16

Thomas David KehoeThomas David Kehoe

3,02111 gold badge1919 silver badges4949 bronze badges