Server: Refactor internal server package to use new state file

This completely rewrites the internal server package. Some advantages:

- Caches less
- Uses a callback interface so that the client package does not get so
 convoluted
- Introduce a new API package that only deals with the server API and
 uses github.com/jwijenbergh/eduoauth-go

1 files changed, 51 insertions, 0 deletions

diff --git a/internal/api/endpoints/endpoints.go b/internal/api/endpoints/endpoints.go
new file mode 100644
index 0000000..11e244b
--- /dev/null
+++ b/internal/api/endpoints/endpoints.go
@@ -0,0 +1,51 @@
+package endpoints
+
+import (
+	"fmt"
+	"net/url"
+)
+
+type List struct {
+	API           string `json:"api_endpoint"`
+	Authorization string `json:"authorization_endpoint"`
+	Token         string `json:"token_endpoint"`
+}
+
+type Versions struct {
+	V2 List `json:"http://eduvpn.org/api#2"`
+	V3 List `json:"http://eduvpn.org/api#3"`
+}
+
+// Endpoints defines the json format for /.well-known/vpn-user-portal".
+type Endpoints struct {
+	API Versions `json:"api"`
+	V   string   `json:"v"`
+}
+
+// Validate validates the endpoints by parsing them and checking the scheme is HTTP
+// An error is returned if they are not valid
+func (e Endpoints) Validate() error {
+	v3 := e.API.V3
+	pAPI, err := url.Parse(v3.API)
+	if err != nil {
+		return fmt.Errorf("failed to parse API endpoint: %w", err)
+	}
+	pAuth, err := url.Parse(v3.Authorization)
+	if err != nil {
+		return fmt.Errorf("failed to parse API authorization endpoint: %w", err)
+	}
+	pToken, err := url.Parse(v3.Token)
+	if err != nil {
+		return fmt.Errorf("failed to parse API token endpoint: %w", err)
+	}
+	if pAPI.Scheme != "https" {
+		return fmt.Errorf("API Scheme: '%s', is not equal to HTTPS", pAPI.Scheme)
+	}
+	if pAPI.Scheme != pAuth.Scheme {
+		return fmt.Errorf("API scheme: '%v', is not equal to authorization scheme: '%v'", pAPI.Scheme, pAuth.Scheme)
+	}
+	if pAPI.Scheme != pToken.Scheme {
+		return fmt.Errorf("API scheme: '%v', is not equal to token scheme: '%v'", pAPI.Scheme, pToken.Scheme)
+	}
+	return nil
+}