feat: defines ExternalAccountClient abstract class for external_account credentials #1030

bojeil-google · 2020-08-11T22:14:59Z

Base external account client is used to instantiate AuthClients for exchanging external account credentials for GCP access token and authorizing requests to GCP APIs.

The base class implements common logic for exchanging various type of external credentials via GCP STS token exchange endpoint for GCP access tokens. The logic of determining and retrieving the external credential based on the environment and credential_source in the credentials JSON file will be left for the subclasses.

…rary-nodejs

…nt credentials

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* chore: updated samples/package.json [ci skip] * chore: updated CHANGELOG.md [ci skip] * chore: updated package.json Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

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…brary-nodejs into external-account-client

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bcoe

Left a few nits, this is looking solid to me.

bcoe · 2020-08-12T18:35:13Z

src/auth/externalclient.ts

+import {ClientAuthentication} from './oauth2common';
+
+/**
+ * The required token exchange grant_type: rfc8693#section-2.1


I appreciate the links to RFCs, this will be useful for future generations.

Yeah, definitely. Let me know anytime something is not clear. I can provide relevant links and context so the code is self-explanatory.

bcoe · 2020-08-12T18:36:17Z

src/auth/externalclient.ts

+/**
+ * Offset to take into account network delays and server clock skews.
+ */
+export const EXPIRATION_TIME_OFFSET = 5 * 60 * 1000;


Where does the 5 minute value come from? wondering if this is similar to where other clients landed.

It is defined here:

google-auth-library-nodejs/src/auth/oauth2client.ts

Line 456 in eb54ee9

opts.eagerRefreshThresholdMillis || 5 * 60 * 1000;

and used here

google-auth-library-nodejs/src/auth/oauth2client.ts

Line 1323 in eb54ee9

? expiryDate <= new Date().getTime() + this.eagerRefreshThresholdMillis

It defaults to 5mins but they allow it to be overridden.

I added a second optional object argument to constructor that takes in a similar RefreshOptions. So the default behavior here is now the same as oauth2client. That object can be extended with additional customization parameters in the future, if needed.

I updated the tests to cover this (custom threshold and option to force refresh or disable refresh on 401/403).

src/auth/externalclient.ts

bcoe · 2020-08-12T18:40:05Z

src/auth/externalclient.ts

+   * @param options The external account options object typically loaded
+   *   from the external account JSON credential file.
+   */
+  constructor(private readonly options: ExternalAccountClientOptions) {


do you know if the readonly modifier applies to accessing properties on the object? I fixed a variety of bugs in this library related to people modifying an object, not realizing it's passed by reference.

If you mean:

client.options.audience = 'overrwrite';

Unfortunately, this will not throw.
I guess readonly acts more like a const for a private or public property.

client.options = 'this will throw';

Though, even then, there are workarounds for that:

Object.defineProperty(client, 'options', { value: 'overrwrite of entire options', });

I find it good practice to use it as it ensures I don't overwrite private and public properties internally that should not be overwritten.

Are you worried that developers could accidentally update the options content and break the behavior here? If so, I have updated the logic so that we just keep copies by value of the options content. So changes to that object will not break the behavior.

bcoe · 2020-08-12T18:41:21Z

src/auth/externalclient.ts

+        // - The response was a 401 or a 403
+        // - The request didn't send a readableStream
+        const isReadableStream = res.config.data instanceof stream.Readable;
+        const isAuthErr = statusCode === 401 || statusCode === 403;


Do we use this retry logic in a few places, it seems like something we should abstract into a helper.

Seems to be mainly in oauth2client which most other clients extend:

google-auth-library-nodejs/src/auth/oauth2client.ts

Line 950 in a7e5701

const isAuthErr = statusCode === 401 || statusCode === 403;

There may be some subtle differences but I can define requestAsync in the base class AuthClient which both classes extend. I can look into it in a separate dedicated PR as this PR is getting a bit too large.

I'd even be happy with a tracking issue, just seems like an area for some code cleanup.

…brary-nodejs into external-account-client

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…tions`.

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bcoe

LGTM.

feat: implements the OAuth token exchange spec based on rfc8693 (#1026) feat: defines ExternalAccountClient abstract class for external_account credentials (#1030) feat: adds service account impersonation to `ExternalAccountClient` (#1041) feat: defines `IdentityPoolClient` used for K8s and Azure workloads (#1042) feat: implements AWS signature version 4 for signing requests (#1047) feat: defines `ExternalAccountClient` used to instantiate external account clients (#1050) feat!: integrates external_accounts with `GoogleAuth` and ADC (#1052) feat: adds text/json credential_source support to IdentityPoolClients (#1059) feat: get AWS region from environment variable (#1067) Co-authored-by: Wilfred van der Deijl <wilfred@vanderdeijl.com> Co-authored-by: Benjamin E. Coe <bencoe@google.com>

grayside and others added 4 commits August 7, 2020 16:32

refactor(samples): idtoken-cloudrun => idtoken-serverless (#1025)

11b0cb7

docs: README updated with new sample paths

4df48df

Merge branch 'byoid' of https://github.com/googleapis/google-auth-lib…

9f60e47

…rary-nodejs

feat: defines ExternalAccountClient abstract class for external_accou…

1a30988

…nt credentials

bojeil-google requested a review from a team as a code owner August 11, 2020 22:14

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google-cla bot added the cla: yes This human has signed the Contributor License Agreement. label Aug 11, 2020

chore: release 6.0.7 (#1023)

6dfee1d

* chore: updated samples/package.json [ci skip] * chore: updated CHANGELOG.md [ci skip] * chore: updated package.json Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

sofisl added automerge Merge the pull request once unit tests and other checks pass. and removed automerge Merge the pull request once unit tests and other checks pass. labels Aug 12, 2020

yoshi-automation and others added 3 commits August 12, 2020 05:22

Adds additional tests for tokens event emission on new access tokens.

6a5458b

Merge branch 'master' of https://github.com/googleapis/google-auth-li…

184b6a7

…brary-nodejs into external-account-client

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renovate-bot and others added 2 commits August 12, 2020 14:04

fix(deps): roll back dependency google-auth-library to ^6.0.6 (#1033)

eb54ee9

Merge branch 'master' of https://github.com/googleapis/google-auth-li…

7b05460

…brary-nodejs into external-account-client

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bojeil-google added 2 commits August 12, 2020 21:56

Addresses review comments.

9e06fa5

Javadoc fix and remove unncessary ! on options.

a1eb968

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Removes unnecessary credential_source from `ExternalAccountClientOp…

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feat: defines ExternalAccountClient abstract class for external_account credentials #1030

feat: defines ExternalAccountClient abstract class for external_account credentials #1030

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feat: defines ExternalAccountClient abstract class for external_account credentials #1030

feat: defines ExternalAccountClient abstract class for external_account credentials #1030

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