/schemas/default does not work with base64 identity schemas

[Benehiko]

Describe the bug

Initial report of this bug from this discussion #1517

The /schemas/default endpoint does not report back the identity schema if it is base64 encoded. It expects only a file or http url to be set as shown here.

Reproducing the bug

Steps to reproduce the behavior:

1. Create base64 encoded identity schema
2. Make API Request to http://127.0.0.1:4434/schemas/default
3. Request fails with response internal server error 500

Server logs

{"audience":"application","error":{"debug":"Get \"base64: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\": unsupported protocol scheme \"base64\"","message":"An internal server error occurred, please contact the system administrator","reason":"The file for this JSON Schema ID could not be found or opened. This is a configuration issue.","status":"Internal Server Error","status_code":500,"trace":"\ngithub.com/ory/kratos/schema.(*Handler).get\n\t/mnt/Data/SoftwareDevelopment/Ory/kratos/schema/handler.go:93\ngithub.com/julienschmidt/httprouter.(*Router).ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/julienschmidt/[email protected]/router.go:387\ngithub.com/urfave/negroni.Wrap.func1\n\t/home/benehiko/go/pkg/mod/github.com/urfave/[email protected]/negroni.go:46\ngithub.com/urfave/negroni.HandlerFunc.ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/urfave/[email protected]/negroni.go:29\ngithub.com/urfave/negroni.middleware.ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/urfave/[email protected]/negroni.go:38\ngithub.com/ory/kratos/metrics/prometheus.(*MetricsManager).ServeHTTP\n\t/mnt/Data/SoftwareDevelopment/Ory/kratos/metrics/prometheus/middleware.go:21\ngithub.com/urfave/negroni.middleware.ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/urfave/[email protected]/negroni.go:38\ngithub.com/ory/x/metricsx.(*Service).ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/ory/[email protected]/metricsx/middleware.go:251\ngithub.com/urfave/negroni.middleware.ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/urfave/[email protected]/negroni.go:38\ngithub.com/ory/x/reqlog.(*Middleware).ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/ory/[email protected]/reqlog/middleware.go:134\ngithub.com/urfave/negroni.middleware.ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/urfave/[email protected]/negroni.go:38\ngithub.com/urfave/negroni.(*Negroni).ServeHTTP\n\t/home/benehiko/go/pkg/mod/github.com/urfave/[email protected]/negroni.go:96\ngithub.com/gorilla/context.ClearHandler.func1\n\t/home/benehiko/go/pkg/mod/github.com/gorilla/[email protected]/context.go:141\nnet/http.HandlerFunc.ServeHTTP\n\t/usr/local/go/src/net/http/server.go:2069\nnet/http.serverHandler.ServeHTTP\n\t/usr/local/go/src/net/http/server.go:2887\nnet/http.(*conn).serve\n\t/usr/local/go/src/net/http/server.go:1952\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1371"},"http_request":{"headers":{"accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9","accept-encoding":"gzip, deflate, br","accept-language":"en-GB,en-US;q=0.9,en;q=0.8","cache-control":"max-age=0","cookie":"csrf_token=Qryw/wCUyseaWUz0dCHSHkc/XWhcwqkHYXltTI1Uu+0=; hblid=zVp58ZEnmLy7kExy3m39N0NBOBri7FoB; olfsk=olfsk9662130290194435","user-agent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36"},"host":"127.0.0.1:4434","method":"GET","path":"/schemas/default","query":null,"remote":"127.0.0.1:36430","scheme":"http"},"http_response":{"status_code":500},"level":"error","msg":"An error occurred while handling a request","service_name":"ORY Kratos","service_version":"master","time":"2021-07-12T12:02:02+02:00"}

Server configuration

version: v0.6.3-alpha.1

dsn: memory

serve:
  public:
    base_url: http://127.0.0.1:4433/
    cors:
      enabled: true
  admin:
    base_url: http://kratos:4434/

selfservice:
  default_browser_return_url: http://127.0.0.1:4455/
  whitelisted_return_urls:
    - http://127.0.0.1:4455

  methods:
    password:
      enabled: true

  flows:
    error:
      ui_url: http://127.0.0.1:4455/error

    settings:
      ui_url: http://127.0.0.1:4455/settings
      privileged_session_max_age: 15m

    recovery:
      enabled: true
      ui_url: http://127.0.0.1:4455/recovery

    verification:
      enabled: true
      ui_url: http://127.0.0.1:4455/verify
      after:
        default_browser_return_url: http://127.0.0.1:4455/

    logout:
      after:
        default_browser_return_url: http://127.0.0.1:4455/auth/login

    login:
      ui_url: http://127.0.0.1:4455/auth/login
      lifespan: 10m

    registration:
      lifespan: 10m
      ui_url: http://127.0.0.1:4455/auth/registration
      after:
        password:
          hooks:
            -
              hook: session

log:
  level: trace
  format: json
  leak_sensitive_values: true

secrets:
  cookie:
    - PLEASE-CHANGE-ME-I-AM-VERY-INSECURE

hashers:
  argon2:
    parallelism: 1
    memory: 128MB
    iterations: 2
    salt_length: 16
    key_length: 16

identity:
  default_schema_url: base64: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

courier:
  smtp:
    connection_uri: smtps://test:test@mailslurper:1025/?skip_ssl_verify=true

Expected behavior

Return the identity schema json

Environment

• Version: v0.6.3-alpha.1
• Environment: Ubuntu 20

Additional context

Other endpoints such as registration seem to work as expected with base64.