chore: override codersdk.SessionTokenCookie in develop.sh #18991

johnstcn · 2025-07-22T16:58:52Z

Enables viewing the Coder UI proxied by Coder.
Exposes an environment variable CODER_DEV_SESSION_TOKEN_COOKIE_PREFIX which allows adding a prefix to the name of the session token cookie. This only works for development builds.

$ CODER_DEV_SESSION_TOKEN_COOKIE_PREFIX=dev ./scripts/develop.sh

$ curl 'https://3000--dev--nonix--cian--apps.dev.coder.com/api/v2/users/me' -H "Cookie: dev_coder_session_token=$(cat .coderv2/session)"
{"id":"fddc81ff-7924-4628-a146-b799d2fb81b4","username":"admin","name":"Admin User","email":"admin@coder.com","created_at":"2025-07-22T13:39:16.670833+01:00","updated_at":"2025-07-22T17:49:38.313364+01:00","last_seen_at":"2025-07-22T16:49:38.313364Z","status":"active","login_type":"password","organization_ids":["c56e87ca-effa-43a6-a464-f25840a47483"],"roles":[{"name":"owner","display_name":"Owner"}]}

EDIT: I tried an alternative implementation instead using -ldflags -X that removes the need for most changes in codersdk.

johnstcn · 2025-07-22T17:05:30Z

site/vite.config.mts

@@ -116,7 +116,7 @@ export default defineConfig({
 				secure: process.env.NODE_ENV === "production",
 			},
 		},
-		allowedHosts: [".coder"],
+		allowedHosts: [".coder", ".dev.coder.com"],


review: also updated allowedHosts for dev URLs.

johnstcn · 2025-07-22T17:05:52Z

scripts/develop.sh

@@ -150,7 +151,7 @@ fatal() {
 	trap 'fatal "Script encountered an error"' ERR

 	cdroot
-	DEBUG_DELVE="${debug}" start_cmd API "" "${CODER_DEV_SHIM}" server --http-address 0.0.0.0:3000 --swagger-enable --access-url "${CODER_DEV_ACCESS_URL}" --dangerous-allow-cors-requests=true --enable-terraform-debug-mode "$@"
+	DEBUG_DELVE="${debug}" CODER_DEV_SESSION_TOKEN_COOKIE_PREFIX="${CODER_DEV_SESSION_TOKEN_COOKIE_PREFIX}" start_cmd API "" "${CODER_DEV_SHIM}" server --http-address 0.0.0.0:3000 --swagger-enable --access-url "${CODER_DEV_ACCESS_URL}" --dangerous-allow-cors-requests=true --enable-terraform-debug-mode "$@"


review: I'm setting the prefix to dev_ by default in develop.sh.

code-asher

I tried it out and it is glorious we can run Coder over dev URLs now 🎉

Too bad we cannot get rid of codersdk.SessionTokenCookie or set it dynamically (at least not as a const), but what can ya do.

Emyrk · 2025-07-22T18:08:41Z

codersdk/client.go

+func GetSessionTokenCookie() string {
+	if buildinfo.IsDev() {
+		if pfx, found := os.LookupEnv("CODER_DEV_SESSION_TOKEN_COOKIE_PREFIX"); found && pfx != "" {
+			return pfx + "_" + SessionTokenCookie
+		}
+	}
+	return SessionTokenCookie
+}


Should SessionTokenCookie just be a var? And a function updates the var?

At the very least, SessionTokenCookie should probably not be exported. Just this function

Yeah I was thinking of doing that but didn't want to make a breaking API change.
But you got me thinking... what do we do for buildinfo.tag?
If I change SessionTokenCookie to a var we can just do the -ldflags -X trick and not have to change anything else :)

bpmct · 2025-07-22T19:09:00Z

woooooooooo!!!!

This reverts commit 9ce2437.

johnstcn · 2025-07-22T22:14:20Z

site/src/api/typesGenerated.ts

-// From codersdk/client.go
-export const SessionTokenCookie = "coder_session_token";
-


This isn't intentional; I need to figure out how to keep this around.
@Emyrk think it's possible to modify this behaviour in apitypings?

For now I'm manually vendoring this into api.ts.

johnstcn · 2025-07-22T22:15:47Z

scripts/build_go.sh

+if [[ "$develop_in_coder" == 1 ]]; then
+	echo "INFO : Overriding codersdk.SessionTokenCookie as we are developing inside a Coder workspace."
+	ldflags+=(
+		-X "'github.com/coder/coder/v2/codersdk.SessionTokenCookie=dev_coder_session_token'"
+	)
+fi


I decided to try this way instead. It's a little more involved but requires less code changes in codersdk. I can remove the echo message if it's annoying.

mtojek

Excellent!!

johnstcn · 2025-07-23T11:25:32Z

site/src/api/api.ts

+/**
+ * Originally from codersdk/client.go.
+ * The below declaration is required to stop Knip from complaining.
+ * @public
+ */
+export const SessionTokenCookie = "coder_session_token";


matifali · 2025-07-23T13:15:04Z

scripts/coder-dev.sh

@@ -35,16 +37,20 @@ CODER_DEV_DIR="$(realpath ./.coderv2)"
 CODER_DELVE_DEBUG_BIN=$(realpath "./build/coder_debug_${GOOS}_${GOARCH}")
 popd

+if [ -n "${CODER_AGENT_URL}" ]; then


We could also check if CODER=true. That's what I do in my dotfiles.

I forgot about that one!

Should also maybe be "${CODER_AGENT_URL:-}" in case the env var is not set, on account of the set -u.

I did that here above (L13) but missed it in develop.sh. Will push a separate PR 👍

#19043

johnstcn added 3 commits July 22, 2025 16:55

feat: allow prefixing coder_session_token cookie

9ce2437

chore: add dev.coder.com to vite allowedHosts

5497686

chore: set CODER_DEV_SESSION_TOKEN_COOKIE_PREFIX in develop.sh

5868b0b

johnstcn self-assigned this Jul 22, 2025

johnstcn changed the title ~~Cj/dev session token cookie prefix~~ chore: add CODER_DEV_SESSION_TOKEN_COOKIE_PREFIX in development mode Jul 22, 2025

johnstcn requested review from code-asher, mtojek and Emyrk July 22, 2025 17:03

johnstcn commented Jul 22, 2025

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code-asher approved these changes Jul 22, 2025

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Emyrk reviewed Jul 22, 2025

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johnstcn added 2 commits July 22, 2025 22:23

Revert "feat: allow prefixing coder_session_token cookie"

6c86d8c

This reverts commit 9ce2437.

chore: use ldflags to override codersdk.SessionTokenCookie at build

a2dcf61

johnstcn commented Jul 22, 2025

View reviewed changes

johnstcn changed the title ~~chore: add CODER_DEV_SESSION_TOKEN_COOKIE_PREFIX in development mode~~ chore: override codersdk.SessionTokenCookie in develop.sh Jul 22, 2025

mtojek approved these changes Jul 23, 2025

View reviewed changes

re-add missing autogenerated export manually

cb6b8b3

mtojek approved these changes Jul 23, 2025

View reviewed changes

make knip shut up

f4e5a14

johnstcn commented Jul 23, 2025

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johnstcn merged commit bb83071 into main Jul 23, 2025
70 of 76 checks passed

johnstcn deleted the cj/dev-session-token-cookie-prefix branch July 23, 2025 11:48

github-actions bot locked and limited conversation to collaborators Jul 23, 2025

matifali reviewed Jul 23, 2025

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chore: override codersdk.SessionTokenCookie in develop.sh #18991

chore: override codersdk.SessionTokenCookie in develop.sh #18991

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		// From codersdk/client.go
		export const SessionTokenCookie = "coder_session_token";

chore: override codersdk.SessionTokenCookie in develop.sh #18991

chore: override codersdk.SessionTokenCookie in develop.sh #18991

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