Client authentication failed in Postman request for Amazon Alexa Smart Home Skill LWA












1














I am referring to Amazon documentation for the purpose of Customer Authentication. Currently, I am using LWA.



Steps I followed:




  1. I enabled the Send Alexa Events Permission from the Alexa developer Console in Build > Permission page.


  2. I took the grant code from the request in the cloudwatch logs which was sent when I logged in using Alexa companion app.



Example:-



    {
"directive": {
"header": {
"messageId": "Example",
"name": "AcceptGrant",
"namespace": "Alexa.Authorization",
"payloadVersion": "3"
},
"payload": {
"grant": {
"code": "Example2",
"type": "OAuth2.AuthorizationCode"
},
"grantee": {
"token": "Example3",
"type": "BearerToken"
}
}
}
}



  1. Permission Page under build on Alexa Developer console gave me client-Id and client-secret Which I used for making the post request to https://api.amazon.com/auth/o2/token.


Example:-



 POST /auth/o2/token HTTP/l.l
Host: api.amazon.com
Content-Type: application/x-www-form-urlencoded;charset=UTF-8
grant_type=authorization_code&code=&client_id=&client_secret=


I passed the code,client_id, and client_secret in the above example and made the post request to this URL https://api.amazon.com/auth/o2/token




  1. I tried using x-www-form-urlencoded;charset=UTF-8 and also JSON for the Content-Type.


I followed the step given in the above documentation and I am stuck on the error ( 401 Unauthorized ):



{
"error_description": "The request has an invalid grant parameter : code",
"error": "invalid_grant"
}


I tried implementing it using Python code and Postman both. Ending up with the Same above error scenario.










share|improve this question





























    1














    I am referring to Amazon documentation for the purpose of Customer Authentication. Currently, I am using LWA.



    Steps I followed:




    1. I enabled the Send Alexa Events Permission from the Alexa developer Console in Build > Permission page.


    2. I took the grant code from the request in the cloudwatch logs which was sent when I logged in using Alexa companion app.



    Example:-



        {
    "directive": {
    "header": {
    "messageId": "Example",
    "name": "AcceptGrant",
    "namespace": "Alexa.Authorization",
    "payloadVersion": "3"
    },
    "payload": {
    "grant": {
    "code": "Example2",
    "type": "OAuth2.AuthorizationCode"
    },
    "grantee": {
    "token": "Example3",
    "type": "BearerToken"
    }
    }
    }
    }



    1. Permission Page under build on Alexa Developer console gave me client-Id and client-secret Which I used for making the post request to https://api.amazon.com/auth/o2/token.


    Example:-



     POST /auth/o2/token HTTP/l.l
    Host: api.amazon.com
    Content-Type: application/x-www-form-urlencoded;charset=UTF-8
    grant_type=authorization_code&code=&client_id=&client_secret=


    I passed the code,client_id, and client_secret in the above example and made the post request to this URL https://api.amazon.com/auth/o2/token




    1. I tried using x-www-form-urlencoded;charset=UTF-8 and also JSON for the Content-Type.


    I followed the step given in the above documentation and I am stuck on the error ( 401 Unauthorized ):



    {
    "error_description": "The request has an invalid grant parameter : code",
    "error": "invalid_grant"
    }


    I tried implementing it using Python code and Postman both. Ending up with the Same above error scenario.










    share|improve this question



























      1












      1








      1







      I am referring to Amazon documentation for the purpose of Customer Authentication. Currently, I am using LWA.



      Steps I followed:




      1. I enabled the Send Alexa Events Permission from the Alexa developer Console in Build > Permission page.


      2. I took the grant code from the request in the cloudwatch logs which was sent when I logged in using Alexa companion app.



      Example:-



          {
      "directive": {
      "header": {
      "messageId": "Example",
      "name": "AcceptGrant",
      "namespace": "Alexa.Authorization",
      "payloadVersion": "3"
      },
      "payload": {
      "grant": {
      "code": "Example2",
      "type": "OAuth2.AuthorizationCode"
      },
      "grantee": {
      "token": "Example3",
      "type": "BearerToken"
      }
      }
      }
      }



      1. Permission Page under build on Alexa Developer console gave me client-Id and client-secret Which I used for making the post request to https://api.amazon.com/auth/o2/token.


      Example:-



       POST /auth/o2/token HTTP/l.l
      Host: api.amazon.com
      Content-Type: application/x-www-form-urlencoded;charset=UTF-8
      grant_type=authorization_code&code=&client_id=&client_secret=


      I passed the code,client_id, and client_secret in the above example and made the post request to this URL https://api.amazon.com/auth/o2/token




      1. I tried using x-www-form-urlencoded;charset=UTF-8 and also JSON for the Content-Type.


      I followed the step given in the above documentation and I am stuck on the error ( 401 Unauthorized ):



      {
      "error_description": "The request has an invalid grant parameter : code",
      "error": "invalid_grant"
      }


      I tried implementing it using Python code and Postman both. Ending up with the Same above error scenario.










      share|improve this question















      I am referring to Amazon documentation for the purpose of Customer Authentication. Currently, I am using LWA.



      Steps I followed:




      1. I enabled the Send Alexa Events Permission from the Alexa developer Console in Build > Permission page.


      2. I took the grant code from the request in the cloudwatch logs which was sent when I logged in using Alexa companion app.



      Example:-



          {
      "directive": {
      "header": {
      "messageId": "Example",
      "name": "AcceptGrant",
      "namespace": "Alexa.Authorization",
      "payloadVersion": "3"
      },
      "payload": {
      "grant": {
      "code": "Example2",
      "type": "OAuth2.AuthorizationCode"
      },
      "grantee": {
      "token": "Example3",
      "type": "BearerToken"
      }
      }
      }
      }



      1. Permission Page under build on Alexa Developer console gave me client-Id and client-secret Which I used for making the post request to https://api.amazon.com/auth/o2/token.


      Example:-



       POST /auth/o2/token HTTP/l.l
      Host: api.amazon.com
      Content-Type: application/x-www-form-urlencoded;charset=UTF-8
      grant_type=authorization_code&code=&client_id=&client_secret=


      I passed the code,client_id, and client_secret in the above example and made the post request to this URL https://api.amazon.com/auth/o2/token




      1. I tried using x-www-form-urlencoded;charset=UTF-8 and also JSON for the Content-Type.


      I followed the step given in the above documentation and I am stuck on the error ( 401 Unauthorized ):



      {
      "error_description": "The request has an invalid grant parameter : code",
      "error": "invalid_grant"
      }


      I tried implementing it using Python code and Postman both. Ending up with the Same above error scenario.







      amazon-web-services oauth postman alexa






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 21 '18 at 14:40

























      asked Nov 21 '18 at 10:24









      Sharvin Shah

      7416




      7416
























          1 Answer
          1






          active

          oldest

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          0














          Here is a sample code to help you and others who are looking to send events to alexa gateway.



          const AWS = require('aws-sdk');
          AWS.config.update({region: 'eu-west-1'});

          // Create the DynamoDB service object
          const ddb = new AWS.DynamoDB({ apiVersion: 'latest' });
          const doc = new AWS.DynamoDB.DocumentClient({
          convertEmptyValues: true,
          service: ddb
          });

          // Using 'request' for http POST and GET request.
          // https://www.npmjs.com/package/requests
          // npm install --save requests
          const r = require('request');

          //Handle Authorization. Call this method from your lambda handler whenever you get Alexa.Authorization message. You will get this message only when you select permission to
          //send events in your Smart Home Skill.
          //Access to Event gateway allows you to enable Proactive Device Discovery and
          //Proactive State Reporting in your skill
          //More information on Alexa.Authorization can be found on https://developer.amazon.com/docs/device-apis/alexa-authorization.html
          function handleAuthorization(request, context, user) {

          //Even when you are using your own authentication, the url below will still
          //point to amazon OAuth token url. The token you obtain here has to be stored
          //separately for this user. Whenever sending an event to alexa event gateway you will
          //require this token.
          //URL below is for EU server. Look at following documentation link to identify correct url
          //for your system.
          //https://developer.amazon.com/docs/smarthome/send-events-to-the-alexa-event-gateway.html
          var url = "https://api.amazon.com/auth/o2/token";
          var body = {
          grant_type : 'authorization_code',
          code : request.directive.payload.grant.code,
          client_id : 'your client id from permissions page on developer portal where you enable alexa events. This is id different than one you specify in account linking settings',
          client_secret : 'client secret from permissions page'
          }

          //https://developer.amazon.com/docs/smarthome/authenticate-a-customer-permissions.html
          r.post({
          url: url,
          form : body
          }, function(error, response, b){
          if (error) { return console.log(error); }
          var body = JSON.parse(b);
          var params = {
          TableName: 'Devices',
          Item: {
          'id' : user,
          'auth_token' : body.access_token,
          'refresh_token' : body.refresh_token
          }
          }
          log("DEBUG:", "Authorization Body", JSON.stringify(body));
          log("DEBUG:", "Authorization Response", JSON.stringify(response));
          log("DEBUG:", "Database Params", JSON.stringify(params));

          // Call DynamoDB to add the item to the table
          var putObjectPromise = doc.put(params).promise();
          //Store auth_token and refresh_token in database. We will need these
          //while sending events to event gateway.
          //Send a success response.
          putObjectPromise.then(function(data) {
          var response = {
          event: {
          header: {
          messageId: request.directive.header.messageId,
          namespace: "Alexa.Authorization",
          name: "AcceptGrant.Response",
          payloadVersion: "3"
          },
          "payload": {
          }
          }
          };

          context.succeed(response);
          }).catch(function(err) {
          //TODO - Add a Authorization error response JSON here.
          console.log(err);
          });
          });
          }





          share|improve this answer























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            1 Answer
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            1 Answer
            1






            active

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            active

            oldest

            votes






            active

            oldest

            votes









            0














            Here is a sample code to help you and others who are looking to send events to alexa gateway.



            const AWS = require('aws-sdk');
            AWS.config.update({region: 'eu-west-1'});

            // Create the DynamoDB service object
            const ddb = new AWS.DynamoDB({ apiVersion: 'latest' });
            const doc = new AWS.DynamoDB.DocumentClient({
            convertEmptyValues: true,
            service: ddb
            });

            // Using 'request' for http POST and GET request.
            // https://www.npmjs.com/package/requests
            // npm install --save requests
            const r = require('request');

            //Handle Authorization. Call this method from your lambda handler whenever you get Alexa.Authorization message. You will get this message only when you select permission to
            //send events in your Smart Home Skill.
            //Access to Event gateway allows you to enable Proactive Device Discovery and
            //Proactive State Reporting in your skill
            //More information on Alexa.Authorization can be found on https://developer.amazon.com/docs/device-apis/alexa-authorization.html
            function handleAuthorization(request, context, user) {

            //Even when you are using your own authentication, the url below will still
            //point to amazon OAuth token url. The token you obtain here has to be stored
            //separately for this user. Whenever sending an event to alexa event gateway you will
            //require this token.
            //URL below is for EU server. Look at following documentation link to identify correct url
            //for your system.
            //https://developer.amazon.com/docs/smarthome/send-events-to-the-alexa-event-gateway.html
            var url = "https://api.amazon.com/auth/o2/token";
            var body = {
            grant_type : 'authorization_code',
            code : request.directive.payload.grant.code,
            client_id : 'your client id from permissions page on developer portal where you enable alexa events. This is id different than one you specify in account linking settings',
            client_secret : 'client secret from permissions page'
            }

            //https://developer.amazon.com/docs/smarthome/authenticate-a-customer-permissions.html
            r.post({
            url: url,
            form : body
            }, function(error, response, b){
            if (error) { return console.log(error); }
            var body = JSON.parse(b);
            var params = {
            TableName: 'Devices',
            Item: {
            'id' : user,
            'auth_token' : body.access_token,
            'refresh_token' : body.refresh_token
            }
            }
            log("DEBUG:", "Authorization Body", JSON.stringify(body));
            log("DEBUG:", "Authorization Response", JSON.stringify(response));
            log("DEBUG:", "Database Params", JSON.stringify(params));

            // Call DynamoDB to add the item to the table
            var putObjectPromise = doc.put(params).promise();
            //Store auth_token and refresh_token in database. We will need these
            //while sending events to event gateway.
            //Send a success response.
            putObjectPromise.then(function(data) {
            var response = {
            event: {
            header: {
            messageId: request.directive.header.messageId,
            namespace: "Alexa.Authorization",
            name: "AcceptGrant.Response",
            payloadVersion: "3"
            },
            "payload": {
            }
            }
            };

            context.succeed(response);
            }).catch(function(err) {
            //TODO - Add a Authorization error response JSON here.
            console.log(err);
            });
            });
            }





            share|improve this answer




























              0














              Here is a sample code to help you and others who are looking to send events to alexa gateway.



              const AWS = require('aws-sdk');
              AWS.config.update({region: 'eu-west-1'});

              // Create the DynamoDB service object
              const ddb = new AWS.DynamoDB({ apiVersion: 'latest' });
              const doc = new AWS.DynamoDB.DocumentClient({
              convertEmptyValues: true,
              service: ddb
              });

              // Using 'request' for http POST and GET request.
              // https://www.npmjs.com/package/requests
              // npm install --save requests
              const r = require('request');

              //Handle Authorization. Call this method from your lambda handler whenever you get Alexa.Authorization message. You will get this message only when you select permission to
              //send events in your Smart Home Skill.
              //Access to Event gateway allows you to enable Proactive Device Discovery and
              //Proactive State Reporting in your skill
              //More information on Alexa.Authorization can be found on https://developer.amazon.com/docs/device-apis/alexa-authorization.html
              function handleAuthorization(request, context, user) {

              //Even when you are using your own authentication, the url below will still
              //point to amazon OAuth token url. The token you obtain here has to be stored
              //separately for this user. Whenever sending an event to alexa event gateway you will
              //require this token.
              //URL below is for EU server. Look at following documentation link to identify correct url
              //for your system.
              //https://developer.amazon.com/docs/smarthome/send-events-to-the-alexa-event-gateway.html
              var url = "https://api.amazon.com/auth/o2/token";
              var body = {
              grant_type : 'authorization_code',
              code : request.directive.payload.grant.code,
              client_id : 'your client id from permissions page on developer portal where you enable alexa events. This is id different than one you specify in account linking settings',
              client_secret : 'client secret from permissions page'
              }

              //https://developer.amazon.com/docs/smarthome/authenticate-a-customer-permissions.html
              r.post({
              url: url,
              form : body
              }, function(error, response, b){
              if (error) { return console.log(error); }
              var body = JSON.parse(b);
              var params = {
              TableName: 'Devices',
              Item: {
              'id' : user,
              'auth_token' : body.access_token,
              'refresh_token' : body.refresh_token
              }
              }
              log("DEBUG:", "Authorization Body", JSON.stringify(body));
              log("DEBUG:", "Authorization Response", JSON.stringify(response));
              log("DEBUG:", "Database Params", JSON.stringify(params));

              // Call DynamoDB to add the item to the table
              var putObjectPromise = doc.put(params).promise();
              //Store auth_token and refresh_token in database. We will need these
              //while sending events to event gateway.
              //Send a success response.
              putObjectPromise.then(function(data) {
              var response = {
              event: {
              header: {
              messageId: request.directive.header.messageId,
              namespace: "Alexa.Authorization",
              name: "AcceptGrant.Response",
              payloadVersion: "3"
              },
              "payload": {
              }
              }
              };

              context.succeed(response);
              }).catch(function(err) {
              //TODO - Add a Authorization error response JSON here.
              console.log(err);
              });
              });
              }





              share|improve this answer


























                0












                0








                0






                Here is a sample code to help you and others who are looking to send events to alexa gateway.



                const AWS = require('aws-sdk');
                AWS.config.update({region: 'eu-west-1'});

                // Create the DynamoDB service object
                const ddb = new AWS.DynamoDB({ apiVersion: 'latest' });
                const doc = new AWS.DynamoDB.DocumentClient({
                convertEmptyValues: true,
                service: ddb
                });

                // Using 'request' for http POST and GET request.
                // https://www.npmjs.com/package/requests
                // npm install --save requests
                const r = require('request');

                //Handle Authorization. Call this method from your lambda handler whenever you get Alexa.Authorization message. You will get this message only when you select permission to
                //send events in your Smart Home Skill.
                //Access to Event gateway allows you to enable Proactive Device Discovery and
                //Proactive State Reporting in your skill
                //More information on Alexa.Authorization can be found on https://developer.amazon.com/docs/device-apis/alexa-authorization.html
                function handleAuthorization(request, context, user) {

                //Even when you are using your own authentication, the url below will still
                //point to amazon OAuth token url. The token you obtain here has to be stored
                //separately for this user. Whenever sending an event to alexa event gateway you will
                //require this token.
                //URL below is for EU server. Look at following documentation link to identify correct url
                //for your system.
                //https://developer.amazon.com/docs/smarthome/send-events-to-the-alexa-event-gateway.html
                var url = "https://api.amazon.com/auth/o2/token";
                var body = {
                grant_type : 'authorization_code',
                code : request.directive.payload.grant.code,
                client_id : 'your client id from permissions page on developer portal where you enable alexa events. This is id different than one you specify in account linking settings',
                client_secret : 'client secret from permissions page'
                }

                //https://developer.amazon.com/docs/smarthome/authenticate-a-customer-permissions.html
                r.post({
                url: url,
                form : body
                }, function(error, response, b){
                if (error) { return console.log(error); }
                var body = JSON.parse(b);
                var params = {
                TableName: 'Devices',
                Item: {
                'id' : user,
                'auth_token' : body.access_token,
                'refresh_token' : body.refresh_token
                }
                }
                log("DEBUG:", "Authorization Body", JSON.stringify(body));
                log("DEBUG:", "Authorization Response", JSON.stringify(response));
                log("DEBUG:", "Database Params", JSON.stringify(params));

                // Call DynamoDB to add the item to the table
                var putObjectPromise = doc.put(params).promise();
                //Store auth_token and refresh_token in database. We will need these
                //while sending events to event gateway.
                //Send a success response.
                putObjectPromise.then(function(data) {
                var response = {
                event: {
                header: {
                messageId: request.directive.header.messageId,
                namespace: "Alexa.Authorization",
                name: "AcceptGrant.Response",
                payloadVersion: "3"
                },
                "payload": {
                }
                }
                };

                context.succeed(response);
                }).catch(function(err) {
                //TODO - Add a Authorization error response JSON here.
                console.log(err);
                });
                });
                }





                share|improve this answer














                Here is a sample code to help you and others who are looking to send events to alexa gateway.



                const AWS = require('aws-sdk');
                AWS.config.update({region: 'eu-west-1'});

                // Create the DynamoDB service object
                const ddb = new AWS.DynamoDB({ apiVersion: 'latest' });
                const doc = new AWS.DynamoDB.DocumentClient({
                convertEmptyValues: true,
                service: ddb
                });

                // Using 'request' for http POST and GET request.
                // https://www.npmjs.com/package/requests
                // npm install --save requests
                const r = require('request');

                //Handle Authorization. Call this method from your lambda handler whenever you get Alexa.Authorization message. You will get this message only when you select permission to
                //send events in your Smart Home Skill.
                //Access to Event gateway allows you to enable Proactive Device Discovery and
                //Proactive State Reporting in your skill
                //More information on Alexa.Authorization can be found on https://developer.amazon.com/docs/device-apis/alexa-authorization.html
                function handleAuthorization(request, context, user) {

                //Even when you are using your own authentication, the url below will still
                //point to amazon OAuth token url. The token you obtain here has to be stored
                //separately for this user. Whenever sending an event to alexa event gateway you will
                //require this token.
                //URL below is for EU server. Look at following documentation link to identify correct url
                //for your system.
                //https://developer.amazon.com/docs/smarthome/send-events-to-the-alexa-event-gateway.html
                var url = "https://api.amazon.com/auth/o2/token";
                var body = {
                grant_type : 'authorization_code',
                code : request.directive.payload.grant.code,
                client_id : 'your client id from permissions page on developer portal where you enable alexa events. This is id different than one you specify in account linking settings',
                client_secret : 'client secret from permissions page'
                }

                //https://developer.amazon.com/docs/smarthome/authenticate-a-customer-permissions.html
                r.post({
                url: url,
                form : body
                }, function(error, response, b){
                if (error) { return console.log(error); }
                var body = JSON.parse(b);
                var params = {
                TableName: 'Devices',
                Item: {
                'id' : user,
                'auth_token' : body.access_token,
                'refresh_token' : body.refresh_token
                }
                }
                log("DEBUG:", "Authorization Body", JSON.stringify(body));
                log("DEBUG:", "Authorization Response", JSON.stringify(response));
                log("DEBUG:", "Database Params", JSON.stringify(params));

                // Call DynamoDB to add the item to the table
                var putObjectPromise = doc.put(params).promise();
                //Store auth_token and refresh_token in database. We will need these
                //while sending events to event gateway.
                //Send a success response.
                putObjectPromise.then(function(data) {
                var response = {
                event: {
                header: {
                messageId: request.directive.header.messageId,
                namespace: "Alexa.Authorization",
                name: "AcceptGrant.Response",
                payloadVersion: "3"
                },
                "payload": {
                }
                }
                };

                context.succeed(response);
                }).catch(function(err) {
                //TODO - Add a Authorization error response JSON here.
                console.log(err);
                });
                });
                }






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 20 hours ago

























                answered Nov 22 '18 at 9:14









                chejaras

                627310




                627310






























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