feat: Make GUC names for headers, cookies and jwt claims compatible with PostgreSQL v14

Getting the value for a header GUC on PostgreSQL v14 is done using `current_setting('request.headers')::json->>'name-of-header'` and in a similar way for `request.cookies` and `request.jwt.claims`

PostgreSQL versions below 14 can opt in to the new JSON GUCs by setting the `db-use-legacy-gucs` config option to false (true by default)

test/io-tests/configs/expected/aliases.config

@@ -13,6 +13,7 @@ db-config = "false"
 db-tx-end = "commit"
 db-uri = "required"
 db-embed-default-join = "left"
+db-use-legacy-gucs = true
 jwt-aud = ""
 jwt-role-claim-key = ".\"aliased\""
 jwt-secret = ""

test/io-tests/configs/expected/boolean-numeric.config

@@ -13,6 +13,7 @@ db-config = "false"
 db-tx-end = "commit"
 db-uri = "required"
 db-embed-default-join = "left"
+db-use-legacy-gucs = true
 jwt-aud = ""
 jwt-role-claim-key = ".\"role\""
 jwt-secret = ""

test/io-tests/configs/expected/boolean-string.config

@@ -13,6 +13,7 @@ db-config = "false"
 db-tx-end = "commit"
 db-uri = "required"
 db-embed-default-join = "left"
+db-use-legacy-gucs = true
 jwt-aud = ""
 jwt-role-claim-key = ".\"role\""
 jwt-secret = ""

test/io-tests/configs/expected/defaults.config

@@ -13,6 +13,7 @@ db-config = "false"
 db-tx-end = "commit"
 db-uri = "required"
 db-embed-default-join = "left"
+db-use-legacy-gucs = true
 jwt-aud = ""
 jwt-role-claim-key = ".\"role\""
 jwt-secret = ""

test/io-tests/configs/expected/no-defaults-with-db-other-authenticator.config

@@ -13,6 +13,7 @@ db-config = "true"
 db-tx-end = "rollback-allow-override"
 db-uri = "<REPLACED_WITH_DB_URI>"
 db-embed-default-join = "inner"
+db-use-legacy-gucs = false
 jwt-aud = "https://otherexample.org"
 jwt-role-claim-key = ".\"other\".\"role\""
 jwt-secret = "ODERREALLYREALLYREALLYREALLYVERYSAFE"

test/io-tests/configs/expected/no-defaults-with-db.config

@@ -13,6 +13,7 @@ db-config = "true"
 db-tx-end = "commit-allow-override"
 db-uri = "<REPLACED_WITH_DB_URI>"
 db-embed-default-join = "inner"
+db-use-legacy-gucs = false
 jwt-aud = "https://example.org"
 jwt-role-claim-key = ".\"a\".\"role\""
 jwt-secret = "OVERRIDEREALLYREALLYREALLYREALLYVERYSAFE"

test/io-tests/configs/expected/no-defaults.config

@@ -13,6 +13,7 @@ db-config = "false"
 db-tx-end = "rollback-allow-override"
 db-uri = "tmp_db"
 db-embed-default-join = "inner"
+db-use-legacy-gucs = false
 jwt-aud = "https://postgrest.org"
 jwt-role-claim-key = ".\"user\"[0].\"real-role\""
 jwt-secret = "c2VjdXJpdHl0aHJvdWdob2JzY3VyaXR5"

test/io-tests/configs/expected/types.config

@@ -13,6 +13,7 @@ db-config = "true"
 db-tx-end = "commit"
 db-uri = "required"
 db-embed-default-join = "left"
+db-use-legacy-gucs = true
 jwt-aud = ""
 jwt-role-claim-key = ".\"role\""
 jwt-secret = ""

test/io-tests/configs/no-defaults-env.yaml

@@ -15,6 +15,7 @@ PGRST_DB_CONFIG: false
 PGRST_DB_TX_END: rollback-allow-override
 PGRST_DB_URI: tmp_db
 PGRST_DB_EMBED_DEFAULT_JOIN: inner
+PGRST_DB_USE_LEGACY_GUCS: false
 PGRST_JWT_AUD: 'https://postgrest.org'
 PGRST_JWT_ROLE_CLAIM_KEY: '.user[0]."real-role"'
 PGRST_JWT_SECRET: c2VjdXJpdHl0aHJvdWdob2JzY3VyaXR5

test/io-tests/configs/no-defaults.config

@@ -13,6 +13,7 @@ db-config = "false"
 db-tx-end = "rollback-allow-override"
 db-uri = "tmp_db"
 db-embed-default-join = "inner"
+db-use-legacy-gucs = false
 jwt-aud = "https://postgrest.org"
 jwt-role-claim-key = ".user[0].\"real-role\""
 jwt-secret = "c2VjdXJpdHl0aHJvdWdob2JzY3VyaXR5"