Hmac sha1 and base 64 encoding in dart
I am trying to produce oauth_signature to use Fatsecret API, but getting an invalid signature error.
To create oauth_signature value the Documentation says:
Use the HMAC-SHA1 signature algorithm as defined by the [RFC2104] to sign the request where text is the Signature Base String and key is the concatenated values of the Consumer Secret and Access Secret separated by a '&' character (show '&' even if Access Secret is empty as some methods do not require an Access Token).
The calculated digest octet string, first base64-encoded per [RFC2045], then escaped using the [RFC3986] percent-encoding (%xx) mechanism is the oauth_signature.
Following code is used to generate the signature
String _generateSignature(String method, String url, Map<String, String> params) {
// sort the parameters
var sortedParams = SplayTreeMap.from(params);
// Concatenate the sortedParams with '&'
String concatenatedParams = sortedParams.keys.map((key) {
return '$key=${sortedParams[key]}';
}).join('&');
// encode the sorted and concatenated params string
var encodedParams = Uri.encodeComponent(concatenatedParams);
var encodedUrl = Uri.encodeComponent(url);
String baseString = '$method&$encodedUrl&$encodedParams';
print(baseString);
String signingKey = '${Uri.encodeComponent(SHARED_SECRET)}&';
var hmac = Hmac(sha1, signingKey.codeUnits);
return base64Encode(hmac.convert(baseString.codeUnits).bytes);
}
When I make API call, it returns
11-12 09:52:45.924 15525-15612/com.example.delete I/flutter: {error: {code: 8, message: Invalid signature: oauth_signature 'y81+JIzX/P+xNqOCYLgbrMtDV2I='}}
Please help me, guys...I am stuck at this for weeks!
dart 
flutter asked Nov 12 '18 at 4:23
Haaris Ahamed
185
add a comment |
I am trying to produce oauth_signature to use Fatsecret API, but getting an invalid signature error.
To create oauth_signature value the Documentation says:
Use the HMAC-SHA1 signature algorithm as defined by the [RFC2104] to sign the request where text is the Signature Base String and key is the concatenated values of the Consumer Secret and Access Secret separated by a '&' character (show '&' even if Access Secret is empty as some methods do not require an Access Token).
The calculated digest octet string, first base64-encoded per [RFC2045], then escaped using the [RFC3986] percent-encoding (%xx) mechanism is the oauth_signature.
Following code is used to generate the signature
String _generateSignature(String method, String url, Map<String, String> params) {
// sort the parameters
var sortedParams = SplayTreeMap.from(params);
// Concatenate the sortedParams with '&'
String concatenatedParams = sortedParams.keys.map((key) {
return '$key=${sortedParams[key]}';
}).join('&');
// encode the sorted and concatenated params string
var encodedParams = Uri.encodeComponent(concatenatedParams);
var encodedUrl = Uri.encodeComponent(url);
String baseString = '$method&$encodedUrl&$encodedParams';
print(baseString);
String signingKey = '${Uri.encodeComponent(SHARED_SECRET)}&';
var hmac = Hmac(sha1, signingKey.codeUnits);
return base64Encode(hmac.convert(baseString.codeUnits).bytes);
}
When I make API call, it returns
11-12 09:52:45.924 15525-15612/com.example.delete I/flutter: {error: {code: 8, message: Invalid signature: oauth_signature 'y81+JIzX/P+xNqOCYLgbrMtDV2I='}}
Please help me, guys...I am stuck at this for weeks!
dart flutter asked Nov 12 '18 at 4:23
Haaris Ahamed
185
Did you figure it out?
– dazza5000
yesterday
add a comment |
I am trying to produce oauth_signature to use Fatsecret API, but getting an invalid signature error.
To create oauth_signature value the Documentation says:
Use the HMAC-SHA1 signature algorithm as defined by the [RFC2104] to sign the request where text is the Signature Base String and key is the concatenated values of the Consumer Secret and Access Secret separated by a '&' character (show '&' even if Access Secret is empty as some methods do not require an Access Token).
The calculated digest octet string, first base64-encoded per [RFC2045], then escaped using the [RFC3986] percent-encoding (%xx) mechanism is the oauth_signature.
Following code is used to generate the signature
String _generateSignature(String method, String url, Map<String, String> params) {
// sort the parameters
var sortedParams = SplayTreeMap.from(params);
// Concatenate the sortedParams with '&'
String concatenatedParams = sortedParams.keys.map((key) {
return '$key=${sortedParams[key]}';
}).join('&');
// encode the sorted and concatenated params string
var encodedParams = Uri.encodeComponent(concatenatedParams);
var encodedUrl = Uri.encodeComponent(url);
String baseString = '$method&$encodedUrl&$encodedParams';
print(baseString);
String signingKey = '${Uri.encodeComponent(SHARED_SECRET)}&';
var hmac = Hmac(sha1, signingKey.codeUnits);
return base64Encode(hmac.convert(baseString.codeUnits).bytes);
}
When I make API call, it returns
11-12 09:52:45.924 15525-15612/com.example.delete I/flutter: {error: {code: 8, message: Invalid signature: oauth_signature 'y81+JIzX/P+xNqOCYLgbrMtDV2I='}}
Please help me, guys...I am stuck at this for weeks!
dart flutter asked Nov 12 '18 at 4:23
Haaris Ahamed
185
I am trying to produce oauth_signature to use Fatsecret API, but getting an invalid signature error.
To create oauth_signature value the Documentation says:
Use the HMAC-SHA1 signature algorithm as defined by the [RFC2104] to sign the request where text is the Signature Base String and key is the concatenated values of the Consumer Secret and Access Secret separated by a '&' character (show '&' even if Access Secret is empty as some methods do not require an Access Token).
The calculated digest octet string, first base64-encoded per [RFC2045], then escaped using the [RFC3986] percent-encoding (%xx) mechanism is the oauth_signature.
Following code is used to generate the signature
String _generateSignature(String method, String url, Map<String, String> params) {
// sort the parameters
var sortedParams = SplayTreeMap.from(params);
// Concatenate the sortedParams with '&'
String concatenatedParams = sortedParams.keys.map((key) {
return '$key=${sortedParams[key]}';
}).join('&');
// encode the sorted and concatenated params string
var encodedParams = Uri.encodeComponent(concatenatedParams);
var encodedUrl = Uri.encodeComponent(url);
String baseString = '$method&$encodedUrl&$encodedParams';
print(baseString);
String signingKey = '${Uri.encodeComponent(SHARED_SECRET)}&';
var hmac = Hmac(sha1, signingKey.codeUnits);
return base64Encode(hmac.convert(baseString.codeUnits).bytes);
}
When I make API call, it returns
11-12 09:52:45.924 15525-15612/com.example.delete I/flutter: {error: {code: 8, message: Invalid signature: oauth_signature 'y81+JIzX/P+xNqOCYLgbrMtDV2I='}}
Please help me, guys...I am stuck at this for weeks!
dart flutter dart flutter asked Nov 12 '18 at 4:23
Haaris Ahamed
185
asked Nov 12 '18 at 4:23
Haaris Ahamed
185
asked Nov 12 '18 at 4:23
Haaris Ahamed
185
asked Nov 12 '18 at 4:23
Haaris Ahamed
185
asked Nov 12 '18 at 4:23
Haaris Ahamed
185
185
Did you figure it out?
– dazza5000
yesterday
add a comment |
Did you figure it out?
– dazza5000
yesterday
Did you figure it out?
– dazza5000
yesterday
Did you figure it out?
– dazza5000
yesterday
add a comment |
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Did you figure it out?
– dazza5000
yesterday