[BREAKING]

Introduce universal profile entity
Remove fs-based capes serving
Rework management API
Rework Redis storage schema
Reducing amount of the bus emitter usage

internal/profiles/provider.go

@@ -0,0 +1,88 @@
+package profiles
+
+import (
+	"errors"
+
+	"github.com/elyby/chrly/db"
+	"github.com/elyby/chrly/mojang"
+)
+
+type ProfilesFinder interface {
+	FindProfileByUsername(username string) (*db.Profile, error)
+}
+
+type MojangProfilesProvider interface {
+	GetForUsername(username string) (*mojang.ProfileResponse, error)
+}
+
+type Provider struct {
+	ProfilesFinder
+	MojangProfilesProvider
+}
+
+func (p *Provider) FindProfileByUsername(username string, allowProxy bool) (*db.Profile, error) {
+	profile, err := p.ProfilesFinder.FindProfileByUsername(username)
+	if err != nil {
+		return nil, err
+	}
+
+	if profile != nil && (profile.SkinUrl != "" || profile.CapeUrl != "") {
+		return profile, nil
+	}
+
+	if allowProxy {
+		mojangProfile, err := p.MojangProfilesProvider.GetForUsername(username)
+		// If we at least know something about the user,
+		// then we can ignore an error and return profile without textures
+		if err != nil && profile != nil {
+			return profile, nil
+		}
+
+		if err != nil || mojangProfile == nil {
+			if errors.Is(err, mojang.InvalidUsername) {
+				return nil, nil
+			}
+
+			return nil, err
+		}
+
+		decodedTextures, err := mojangProfile.DecodeTextures()
+		if err != nil {
+			return nil, err
+		}
+
+		profile = &db.Profile{
+			Uuid:     mojangProfile.Id,
+			Username: mojangProfile.Name,
+		}
+
+		// There might be no textures property
+		if decodedTextures != nil {
+			if decodedTextures.Textures.Skin != nil {
+				profile.SkinUrl = decodedTextures.Textures.Skin.Url
+				if decodedTextures.Textures.Skin.Metadata != nil {
+					profile.SkinModel = decodedTextures.Textures.Skin.Metadata.Model
+				}
+			}
+
+			if decodedTextures.Textures.Cape != nil {
+				profile.CapeUrl = decodedTextures.Textures.Cape.Url
+			}
+		}
+
+		var texturesProp *mojang.Property
+		for _, prop := range mojangProfile.Props {
+			if prop.Name == "textures" {
+				texturesProp = prop
+				break
+			}
+		}
+
+		if texturesProp != nil {
+			profile.MojangTextures = texturesProp.Value
+			profile.MojangSignature = texturesProp.Signature
+		}
+	}
+
+	return profile, nil
+}