How to code Multipart-form POST REQUEST using apollo-datasource-rest - rest

Question

I want to code the multipart-form POST REQUEST below using apollo-datasource-rest
My attempt to code this leads to a BAD REQUEST error
const { RESTDataSource } = require('apollo-datasource-rest');
process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';
class SalesforceApi extends RESTDataSource {
constructor() {
super();
this.initialize({});
this.getAccessToken()
.then((accessToken) => {
this.headers = {
Authorization: `Bearer ${accessToken}`,
};
});
}
async getAccessToken() {
console.log('Getting Salesforce access token');
try {
const response = await this.post(
'https://test.salesforce.com/services/oauth2/token',
{
username: 'FILTERED#FILTERED',
password: `${'FILTERED'}`,
grant_type: 'password',
client_id: 'FILTERED',
client_secret: 'FILTERED',
},
{
headers: {
'Content-Type': 'multipart/form-data',
},
},
);
const { accessToken } = response;
console.log(`ChangeGear sessionId: ${accessToken}`);
return accessToken;
} catch (error) {
console.log(`${error}`);
}
return 'No access token!!!';
}
module.exports = SalesforceApi;
[server:salesforce:local] POST https://test.salesforce.com/services/oauth2/token (343ms)
[server:salesforce:local] Error: 400: Bad Request

Answer 1

If memory serves correctly, form data is serialized slightly differently hence why the FormData interface exists. And the apollo-datasource-rest's this.post method is just a wrapper around fetch, so something like the below should work.
Instead of passing the body as a JSON object, try something like this
const formData = new FormData();
formData.append('username', 'FILTERED#FILTERED');
// ... more append lines for your data
const response = await this.post(
'https://test.salesforce.com/services/oauth2/token',
formData
{
headers: {
'Content-Type': 'multipart/form-data',
},
},
);