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<@U04S8PLJWMT> I'm trying to setup an oauth2 authe...
# replication-ask-ai
l
@kapa.ai I'm trying to setup an oauth2 authenticator I'm copying the example, however it errors this is the access token url https://auth.host.com/oauth2/token?{{client_id_key}}={{client_id_value}}&amp;{{client_secret_key}}={{client_secret_value}}&amp;{{auth_code_key}}={{auth_code_value}}&amp;{{redirect_uri_key}}={{ {{ redirect_uri_value }} | urlEncoder }} "message": "Internal Server Error: Error parsing '{{ redirect_uri_value': syntax error at position 202, encountered '}', expected ':'",
k
The error comes from the Jinja expression in your 
redirect_uri
part, not from the OAuth template variables themselves. In the example docs, the 
access_token_url
is kept simple, without filters, e.g.:
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yaml access_token_url: >-   <https://yourconnectorservice.com/oauth/token?client_id={{client_id_value}}&client_secret={{client_secret_value}}&code={{auth_code_value}}>
and the 
redirect_uri
is used as 
{{ redirect_uri_value }}
directly in the URL or moved into 
access_token_params
if needed. [[Basic OAuth](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#basic-oauth-flow); [Template vars](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#available-template-variables)] Your current snippet:
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text ...&{{redirect_uri_key}}={{> {{ redirect_uri_value }} | urlEncoder }}
is invalid Jinja: - 
{{> {{ redirect_uri_value }} | urlEncoder }}
has an extra 
{
and 
>
and is missing a closing 
}}
in the right place. - The parser error 
Error parsing '{{ redirect_uri_value': syntax error at position ..., encountered '}', expected ':'
is exactly from this malformed expression. To fix it, remove the extra characters and filter usage, and follow the pattern from the docs. For a basic flow:
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yaml access_token_url: >-   <https://auth.host.com/oauth2/token?{{client_id_key}}={{client_id_value}}&{{client_secret_key}}={{client_secret_value}}&{{auth_code_key}}={{auth_code_value}}&{{redirect_uri_key}}={{redirect_uri_value}}>
If your provider requires JSON‑encoded parameters in the body instead of query params, move them into 
access_token_params
as shown in the advanced example: [[JSON-encoded params](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#advanced-case-access-token-url-query-parameters-should-be-json-encoded)]
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yaml access_token_url: >-   <https://auth.host.com/oauth2/token> access_token_params:   "{{ client_id_key }}": "{{ client_id_value }}"   "{{ client_secret_key }}": "{{ client_secret_value }}"   "{{ auth_code_key }}": "{{ auth_code_value }}"   "{{ redirect_uri_key }}": "{{ redirect_uri_value }}"
There is no mention in the docs of using a 
urlEncoder
filter in these templates, so if you need URL encoding, the knowledge sources do not describe a supported way to do that declaratively.
l
@kapa.ai I'm tyring to do this in the access token headers, per the example on airbyte {"Authorization":"Basic {{ {{ client_id_value }}:{{ client_secret_value }} | base64Encoder }}"} this is invalid syntax
k
A message from kapa.ai
You’re right: that expression is invalid as written. The docs’ working example uses a different (Jinja‑style) syntax than what you’ve typed. From the Airbyte OAuth advanced example, the header with a base64‑encoded 
client_id:client_secret
looks like this: [[Advanced header](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#advanced-case-client-secret-is-a-request-header-not-a-query-parameter)]
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yaml access_token_headers:   SECRETHEADER: "{{ (client_id_value ~ ':' ~ client_secret_value) | b64encode }}"
Adapting that pattern to your 
Authorization
header, you should write:
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yaml access_token_headers:   Authorization: "{{ (client_id_value ~ ':' ~ client_secret_value) | b64encode }}"
Key points based on the docs: - Use 
{{ ... }}
only once around the whole expression. - Concatenate strings with 
~
, e.g. 
(client_id_value ~ ':' ~ client_secret_value)
. - Apply the base64 filter (
b64encode
in the example) after the expression with 
|
. [[Advanced header](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#advanced-case-client-secret-is-a-request-header-not-a-query-parameter)] The knowledge sources don’t show a 
base64Encoder
filter name; they use 
b64encode
in the example, so if 
base64Encoder
is failing, prefer the documented 
b64encode
form.
l
@kapa.ai "message": "Internal Server Error: Undefined parameter '{{ config[\"client_id\"] }}' necessary for the OAuth Flow.", but its defined in the inutsp
k
A message from kapa.ai
That error usually means Airbyte can’t resolve the template you’re using for 
client_id
in the OAuth config, even if the field exists in the connector’s 
connection_specification
. From the docs, the recommended pattern is: 1. Expose 
client_id
in the spec (what the user fills in):
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yaml spec:   connection_specification:     type: object     required:       - client_id       - client_secret     properties:       client_id:         type: string       client_secret:         type: string
2. Wire it into the authenticator using 
config[...]
:
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yaml definitions:   base_requester:     type: HttpRequester     url_base: <https://example.com>     authenticator:       type: OAuthAuthenticator       refresh_request_body: {}       client_id: "{{ config['client_id'] }}"       client_secret: "{{ config['client_secret'] }}"
3. **In the advanced_auth block, use the template variables (
client_id_value
, etc.), not `config[...]`:**
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yaml advanced_auth:   auth_flow_type: oauth2.0   oauth_config_specification:     oauth_connector_input_specification:       consent_url: >-         <https://yourconnectorservice.com/oauth/consent?client_id={{client_id_value}}&redirect_uri={{redirect_uri_value}}&state={{state}}>       access_token_url: >-         <https://yourconnectorservice.com/oauth/token?client_id={{client_id_value}}&client_secret={{client_secret_value}}&code={{auth_code_value}}>
Here, 
{{ client_id_value }}
is automatically resolved from the config field you wired via 
client_id
in the authenticator; you do not use 
{{ config["client_id"] }}
inside the OAuth flow templates. [[Basic OAuth flow](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#basic-oauth-flow); [Template variables](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#available-template-variables)] So if you currently have something like this in your OAuth section:
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yaml access_token_url: >-   <https://auth.host.com/oauth2/token?client_id={{> config["client_id"] }}&...
change it to:
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yaml access_token_url: >-   <https://auth.host.com/oauth2/token?client_id={{> client_id_value }}&...
and ensure: - 
client_id
is in 
connection_specification.required
and 
properties
. - The authenticator’s 
client_id
field is set to 
{{ config['client_id'] }}
(or the correct nested path). - The OAuth templates only use the documented variables (
client_id_value
, 
client_secret_value
, etc.). [[Template variables](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#available-template-variables)] If after that you still see “Undefined parameter '{{ config["client_id"] }}'”, it likely means there is still at least one 
{{ config["client_id"] }}
reference inside the 
oauth_config_specification
block; replace all of those with the corresponding 
*_value
variables.
l
@kapa.ai ok, this worked in the "Access Token Params" However, I try to use the same values (or pull the from the config) on the Refresh token configuration and it errors: No filter named 'b64encode'.\n File \"<introspection>\", line 1"} this is the templated Refresh Token headers { "Content-Type": "application/x-www-form-urlencoded", "Authorization": "Basic {{ (config['client_id'] ~ ':' ~ config['client_secret']) | b64encode }}" }
k
A message from kapa.ai
The knowledge sources confirm that 
b64encode
is a valid interpolation method for OAuth flows, but they do not explicitly state that all template filters are available in every context (e.g., 
OAuthAuthenticator.refresh_request_headers
).[[Template methods](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#available-template-variables-pipe-methods)] Because of that, I can’t be fully certain, but the error strongly suggests that 
b64encode
is not available (or not enabled) in that specific context. A few concrete points based on the docs: 1. Where 
b64encode
is shown as supported The docs list 
b64encode
as an available pipe method for “Declarative OAuth 2.0” templates, and use it in the OAuth flow example for `access_token_headers`:
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yaml    access_token_headers:      SECRETHEADER: "{{ (client_id_value ~ ':' ~ client_secret_value) | b64encode }}"
[[Advanced header](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#advanced-case-client-secret-is-a-request-header-not-a-query-parameter)] 2. Your failing usage is in 
OAuthAuthenticator
(refresh) headers Your snippet:
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json    {      "Content-Type": "application/x-www-form-urlencoded",      "Authorization": "Basic {{ (config['client_id'] ~ ':' ~ config['client_secret']) | b64encode }}"    }
is inside 
refresh_request_headers
of 
OAuthAuthenticator
(the component used by the declarative 
HttpRequester
).[[OAuthAuthenticator](https://docs.airbyte.com/platform/connector-development/config-based/understanding-the-yaml-file/reference#/definitions/OAuthAuthenticator)] The docs show that 
refresh_request_headers
is an 
object
and that its values can be templated with 
config[...]
, but they do not show any example using pipe methods like 
b64encode
there—only in the OAuth flow (
access_token_headers
) examples.[[OAuthAuthenticator](https://docs.airbyte.com/platform/connector-development/config-based/understanding-the-yaml-file/reference#/definitions/OAuthAuthenticator); [Advanced header](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#advanced-case-client-secret-is-a-request-header-not-a-query-parameter)] Given your error: > No filter named 'b64encode' the most defensible interpretation is: the Jinja environment used for 
OAuthAuthenticator
headers does not have 
b64encode
registered, even though the OAuth flow templates do. 3. What you can safely do with the info we have From the docs, we can say with confidence: - 
b64encode
is supported in OAuth flow templates (e.g., 
access_token_headers
).[[Template methods](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#available-template-variables-pipe-methods); [Advanced header](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#advanced-case-client-secret-is-a-request-header-not-a-query-parameter)] - 
refresh_request_headers
supports templating with 
config[...]
variables, but the docs do not explicitly confirm that pipe methods like 
b64encode
are available there.[[OAuthAuthenticator](https://docs.airbyte.com/platform/connector-development/config-based/understanding-the-yaml-file/reference#/definitions/OAuthAuthenticator)] Because the knowledge sources don’t document 
b64encode
in 
refresh_request_headers
, I cannot reliably propose a fully supported workaround that still uses that filter in this context. --- Summary - Your syntax for the header expression is correct Jinja. - The error is due to 
b64encode
not being recognized in the 
OAuthAuthenticator.refresh_request_headers
context. - The docs only demonstrate 
b64encode
in OAuth flow templates (
access_token_headers
), not in the refresh-token headers of 
OAuthAuthenticator
, so there is no documented way (in these sources) to base64‑encode the header value in that specific place.
l
@kapa.ai seems really counter intuitive that its available everywhere but magically not here right?
k
A message from kapa.ai
You’re right that it feels counter‑intuitive. From the docs we have, two slightly different worlds are described: 1. Declarative OAuth flow templates (e.g. 
access_token_headers
) Here, Airbyte explicitly documents pipe methods like 
b64encode
and shows them in use:
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yaml    access_token_headers:      SECRETHEADER: "{{ (client_id_value ~ ':' ~ client_secret_value) | b64encode }}"
[[Advanced header](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#advanced-case-client-secret-is-a-request-header-not-a-query-parameter); [Pipe methods](https://docs.airbyte.com/platform/connector-development/config-based/advanced-topics/oauth#available-template-variables-pipe-methods)] 2. 
OAuthAuthenticator
fields (e.g. 
refresh_request_headers
) The reference only states that these can use 
config[...]
variables; it does not show any example using filters like 
b64encode
there, nor does it say that the OAuth pipe methods are available in this context.[[OAuthAuthenticator](https://docs.airbyte.com/platform/connector-development/config-based/understanding-the-yaml-file/reference#/definitions/OAuthAuthenticator)] Given your error (
No filter named 'b64encode'
) and the absence of any example or statement that 
b64encode
works in 
refresh_request_headers
, the safest conclusion from the docs is: - The special OAuth pipe methods (like 
b64encode
) are documented and supported in OAuth flow templates, but the knowledge sources do not confirm they’re available in `OAuthAuthenticator`’s refresh headers. So yes, from a user perspective it is unintuitive; but based on the documentation we have, it’s also not clearly specified that these filters should work in that particular place, which matches the behavior you’re seeing.
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