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Expose IdentityId in cognito_credentials to upload to S3 user folder #22

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merged 1 commit into from
Jan 28, 2020
Merged

Expose IdentityId in cognito_credentials to upload to S3 user folder #22

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25 changes: 21 additions & 4 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -403,7 +403,7 @@ print(credentials.sessionToken);

#### For S3 Uploads

S3 Uploads using HTTP Presigned Post.
S3 Upload to user "folder" using HTTP Presigned Post.

```dart
import 'dart:convert';
Expand Down Expand Up @@ -466,6 +466,7 @@ class Policy {

@override
String toString() {
// Safe to remove the "acl" line if your bucket has no ACL permissions
return '''
{ "expiration": "${this.expiration}",
"conditions": [
Expand Down Expand Up @@ -517,8 +518,12 @@ void main() async {
final multipartFile = http.MultipartFile('file', stream, length,
filename: path.basename(file.path));

final String fileName = 'square-cinnamon.jpg';
final String usrIdentityId = _credentials.userIdentityId;
final String bucketKey = 'test/$usrIdentityId/$fileName';

final policy = Policy.fromS3PresignedPost(
'test/square-cinnamon.jpg',
bucketKey,
'my-s3-bucket',
15,
_credentials.accessKeyId,
Expand All @@ -531,7 +536,7 @@ void main() async {

req.files.add(multipartFile);
req.fields['key'] = policy.key;
req.fields['acl'] = 'public-read';
req.fields['acl'] = 'public-read'; // Safe to remove this if your bucket has no ACL permissions
req.fields['X-Amz-Credential'] = policy.credential;
req.fields['X-Amz-Algorithm'] = 'AWS4-HMAC-SHA256';
req.fields['X-Amz-Date'] = policy.datetime;
Expand All @@ -550,6 +555,19 @@ void main() async {
}
```

The role attached to the identity pool (e.g. the ..._poolAuth role) should contain a policy like this:

```json
{
"Effect": "Allow",
"Action": [
"s3:PutObject",
"s3:GetObject"
],
"Resource": "arn:aws:s3:::BUCKET_NAME/test/${cognito-identity.amazonaws.com:sub}/*"
}
```

#### For S3 GET Object

Signing S3 GET Object using `Authorization` header.
Expand Down Expand Up @@ -866,4 +884,3 @@ CognitoCredentials _credential = new CognitoCredentials('ap-southeast-1_xxxxxxxx
await _credential.getAwsCredentials(accessToken, 'graph.facebook.com')
print(_credential.sessionToken);
```

6 changes: 4 additions & 2 deletions lib/src/cognito_credentials.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@ class CognitoCredentials {
String secretAccessKey;
String sessionToken;
int expireTime;
String userIdentityId;

CognitoCredentials(String identityPoolId, CognitoUserPool pool,
{String region, String userPoolId}) {
_pool = pool;
Expand All @@ -30,14 +32,14 @@ class CognitoCredentials {
if (expireTime == null ||
DateTime.now().millisecondsSinceEpoch > expireTime - 60000) {
final identityId = CognitoIdentityId(_identityPoolId, _pool);
final identityIdId = await identityId.getIdentityId(token, authenticator);
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userIdentityId = await identityId.getIdentityId(token, authenticator);

authenticator ??= 'cognito-idp.$_region.amazonaws.com/$_userPoolId';
final Map<String, String> loginParam = {
authenticator: token,
};
final Map<String, dynamic> paramsReq = {
'IdentityId': identityIdId,
'IdentityId': userIdentityId,
'Logins': loginParam,
};

Expand Down