Implement basic web server structure and get paste endpoint

internal/web/controllers/v1/pastes.go

@@ -0,0 +1,47 @@
+package v1
+
+import (
+	"encoding/json"
+	"github.com/Lukaesebrot/pasty/internal/storage"
+	"github.com/bwmarrin/snowflake"
+	"github.com/fasthttp/router"
+	"github.com/valyala/fasthttp"
+)
+
+// InitializePastesController initializes the '/v1/pastes/*' controller
+func InitializePastesController(group *router.Group) {
+	group.GET("/{id}", v1GetPaste)
+}
+
+// v1GetPaste handles the 'GET /v1/pastes/{id}' endpoint
+func v1GetPaste(ctx *fasthttp.RequestCtx) {
+	// Parse the ID
+	id, err := snowflake.ParseString(ctx.UserValue("id").(string))
+	if err != nil {
+		ctx.SetStatusCode(fasthttp.StatusBadRequest)
+		ctx.SetBodyString("invalid ID format")
+		return
+	}
+
+	// Retrieve the paste
+	paste, err := storage.Current.Get(id)
+	if err != nil {
+		ctx.SetStatusCode(fasthttp.StatusInternalServerError)
+		ctx.SetBodyString(err.Error())
+		return
+	}
+	if paste == nil {
+		ctx.SetStatusCode(fasthttp.StatusNotFound)
+		ctx.SetBodyString("paste not found")
+		return
+	}
+
+	// Respond with the paste
+	jsonData, err := json.Marshal(paste)
+	if err != nil {
+		ctx.SetStatusCode(fasthttp.StatusInternalServerError)
+		ctx.SetBodyString(err.Error())
+		return
+	}
+	ctx.SetBody(jsonData)
+}