chore: Move httpapi, httpmw, & database into coderd (#568)

* chore: Move httpmw to /coderd directory
httpmw is specific to coderd and should be scoped under coderd

* chore: Move httpapi to /coderd directory
httpapi is specific to coderd and should be scoped under coderd

* chore: Move database  to /coderd directory
database is specific to coderd and should be scoped under coderd

* chore: Update codecov & gitattributes for generated files
* chore: Update Makefile

coderd/httpmw/userparam.go

@@ -0,0 +1,54 @@
+package httpmw
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+
+	"github.com/coder/coder/coderd/database"
+	"github.com/coder/coder/coderd/httpapi"
+)
+
+type userParamContextKey struct{}
+
+// UserParam returns the user from the ExtractUserParam handler.
+func UserParam(r *http.Request) database.User {
+	user, ok := r.Context().Value(userParamContextKey{}).(database.User)
+	if !ok {
+		panic("developer error: user parameter middleware not provided")
+	}
+	return user
+}
+
+// ExtractUserParam extracts a user from an ID/username in the {user} URL parameter.
+func ExtractUserParam(db database.Store) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+			userID := chi.URLParam(r, "user")
+			if userID == "" {
+				httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
+					Message: "user id or name must be provided",
+				})
+				return
+			}
+			apiKey := APIKey(r)
+			if apiKey.UserID != userID && userID != "me" {
+				httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
+					Message: "getting non-personal users isn't supported yet",
+				})
+				return
+			}
+			user, err := db.GetUserByID(r.Context(), apiKey.UserID)
+			if err != nil {
+				httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
+					Message: fmt.Sprintf("get user: %s", err.Error()),
+				})
+			}
+
+			ctx := context.WithValue(r.Context(), userParamContextKey{}, user)
+			next.ServeHTTP(rw, r.WithContext(ctx))
+		})
+	}
+}