rock
4d23c983ab
The init container fetched a token once at pod start with a client_credentials grant against a web app. A web app has no such grant, so the fetch could not work; and a token fetched once is dead within the hour while the pod runs for weeks. llm-token-vendor runs beside the app. It signs a machine-key assertion for the paperless-llm service account, exchanges it for a token, and rewrites /app/data/llm_token.txt atomically at 80% of the token lifetime. The vendor image keeps using CUSTOM_API_KEY_FILE, so it needs no change and no OIDC support. The key is re-read on every mint, so a rotation lands without a restart: publish the new key, the next mint uses it, retire the old one. paperless-llm is a separate service account from poimen-llm, so revoking one caller leaves the other working.
65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
package main
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/base64"
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"encoding/json"
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"encoding/pem"
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"strings"
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"testing"
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"time"
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)
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func key(t *testing.T) []byte {
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t.Helper()
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k, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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t.Fatalf("cannot generate a key: %v", err)
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}
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return pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)})
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}
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func seg(t *testing.T, s string, out any) {
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t.Helper()
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raw, err := base64.RawURLEncoding.DecodeString(s)
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if err != nil {
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t.Fatalf("not base64url: %v", err)
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}
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if err := json.Unmarshal(raw, out); err != nil {
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t.Fatalf("not JSON: %v", err)
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}
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}
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func TestAssertionCarriesTheKeyAndTheAudience(t *testing.T) {
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c := config{issuer: "https://zitadel.example", userID: "3970", keyID: "3971"}
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tok, err := assertion(c, time.Unix(1_700_000_000, 0), key(t))
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if err != nil {
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t.Fatalf("signing failed: %v", err)
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}
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parts := strings.Split(tok, ".")
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if len(parts) != 3 {
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t.Fatalf("a JWT has three segments, got %d", len(parts))
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}
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var h map[string]any
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seg(t, parts[0], &h)
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if h["kid"] != "3971" || h["alg"] != "RS256" {
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t.Fatalf("header must name the key and the algorithm, got %v", h)
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}
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var cl map[string]any
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seg(t, parts[1], &cl)
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if cl["iss"] != "3970" || cl["sub"] != "3970" || cl["aud"] != "https://zitadel.example" {
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t.Fatalf("claims are wrong: %v", cl)
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}
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if int64(cl["iat"].(float64)) != 1_699_999_995 {
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t.Fatalf("iat must be backdated five seconds, got %v", cl["iat"])
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}
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}
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func TestAssertionRejectsAKeyThatIsNotPEM(t *testing.T) {
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if _, err := assertion(config{userID: "u", issuer: "i"}, time.Now(), []byte("nope")); err == nil {
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t.Fatalf("a non-PEM key must be rejected")
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}
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}
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