🎨 add helper functions and general cleanup

Dockerfile

@@ -0,0 +1,47 @@
+# Copyright 2024 Florian Beisel
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Start from a base image with Go installed and C libraries needed for SQLite.
+FROM golang:1.21-bookworm as builder
+
+# Set the working directory.
+WORKDIR /app
+
+# Copy the go.mod and go.sum files first and download the modules. 
+# This is to take advantage of Docker's cache layers.
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy the rest of the source code.
+COPY . .
+
+# Build the binary. CGO is enabled by default in the official Go images.
+RUN go build -o app .
+
+# Use Debian as the base for the runtime image as it includes necessary C libraries.
+FROM debian:bookworm-slim
+
+# Set the working directory in the container.
+WORKDIR /root/
+
+# Copy the binary from the builder stage.
+COPY --from=builder /app/app .
+
+# Copy the binary from the builder stage.
+COPY --from=builder /app/db/migrations db/migrations
+
+# Add any runtime dependencies here, if needed.
+
+# Command to run the executable.
+CMD ["./app"]

api/rule_handlers.go

@@ -17,11 +17,19 @@ package api
 import (
 	"errors"
 	"net/http"
+	"reflect"
 
 	"git.beisel.it/florian/hostname-service/rules"
 	"github.com/gin-gonic/gin"
 )
 
+// @Summary		Returns a list of available rules
+// @Description	Return a list of names of Rules which are known in the RulesRegistry
+// @ID				get-rules
+// @Produce		json
+// @Security		Bearer
+// @Tags			Querying Rules
+// @Router			/rules [get]
 func ListAvailableRules(c *gin.Context) {
 	descriptions := make(map[string]string)
 	for category, descriptor := range rules.RulesRegistry {
@@ -36,3 +44,44 @@ func getHostnameRuleByCategory(category string) (rules.HostnameRule, error) {
 	}
 	return nil, errors.New("unknown category")
 }
+
+// @Summary		Returns details about a rule
+// @Description	Returns two obea an Input Object and an Output Object
+// @Description	describing the Rules stored values and required parameters
+// @ID				get-rule-details
+// @Produce		json
+// @Success		200	{object}	models.SimpleHostnameResponse	"Hostname"
+// @Security		Bearer
+// @Tags			Querying Rules
+// @Router			/rules/:rule [get]
+func GetRuleStruct(c *gin.Context) {
+	ruleName := c.Param("rule")
+
+	descriptor, exists := rules.RulesRegistry[ruleName]
+	if !exists {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Rule not found"})
+		return
+	}
+
+	// Create instances of the rule and its input struct
+	ruleInstance := descriptor.Factory()
+	inputInstance := reflect.New(reflect.TypeOf(ruleInstance).Elem()).Interface()
+
+	// Serialize instances to JSON
+	ruleJSON, err := rules.StructToJSON(ruleInstance)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Error serializing rule struct"})
+		return
+	}
+
+	inputJSON, err := rules.StructToJSON(inputInstance)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Error serializing input struct"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"input":  inputJSON,
+		"output": ruleJSON,
+	})
+}

db/migrations/2_create_hostnames_table.up.sql

@@ -1,4 +1,4 @@
-CREATE TABLE hostnames (
+CREATE TABLE IF NOT EXISTS hostnames (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
     category TEXT NOT NULL,
     hostname TEXT NOT NULL,

docs/docs.go

@@ -101,32 +101,6 @@ const docTemplate = `{
                 }
             }
         },
-        "/api/rules": {
-            "get": {
-                "description": "Get a list of all available hostname generation rules.",
-                "consumes": [
-                    "application/json"
-                ],
-                "produces": [
-                    "application/json"
-                ],
-                "tags": [
-                    "Rules"
-                ],
-                "summary": "List Available Rules",
-                "responses": {
-                    "200": {
-                        "description": "List of available rules with descriptions",
-                        "schema": {
-                            "type": "object",
-                            "additionalProperties": {
-                                "type": "string"
-                            }
-                        }
-                    }
-                }
-            }
-        },
         "/api/server": {
             "put": {
                 "security": [
@@ -286,6 +260,51 @@ const docTemplate = `{
                 }
             }
         },
+        "/rules": {
+            "get": {
+                "security": [
+                    {
+                        "Bearer": []
+                    }
+                ],
+                "description": "Return a list of names of Rules which are known in the RulesRegistry",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Querying Rules"
+                ],
+                "summary": "Returns a list of available rules",
+                "operationId": "get-rules",
+                "responses": {}
+            }
+        },
+        "/rules/:rule": {
+            "get": {
+                "security": [
+                    {
+                        "Bearer": []
+                    }
+                ],
+                "description": "Returns two obea an Input Object and an Output Object\ndescribing the Rules stored values and required parameters",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Querying Rules"
+                ],
+                "summary": "Returns details about a rule",
+                "operationId": "get-rule-details",
+                "responses": {
+                    "200": {
+                        "description": "Hostname",
+                        "schema": {
+                            "$ref": "#/definitions/models.SimpleHostnameResponse"
+                        }
+                    }
+                }
+            }
+        },
         "/{category}": {
             "get": {
                 "security": [

docs/swagger.json

@@ -95,32 +95,6 @@
                 }
             }
         },
-        "/api/rules": {
-            "get": {
-                "description": "Get a list of all available hostname generation rules.",
-                "consumes": [
-                    "application/json"
-                ],
-                "produces": [
-                    "application/json"
-                ],
-                "tags": [
-                    "Rules"
-                ],
-                "summary": "List Available Rules",
-                "responses": {
-                    "200": {
-                        "description": "List of available rules with descriptions",
-                        "schema": {
-                            "type": "object",
-                            "additionalProperties": {
-                                "type": "string"
-                            }
-                        }
-                    }
-                }
-            }
-        },
         "/api/server": {
             "put": {
                 "security": [
@@ -280,6 +254,51 @@
                 }
             }
         },
+        "/rules": {
+            "get": {
+                "security": [
+                    {
+                        "Bearer": []
+                    }
+                ],
+                "description": "Return a list of names of Rules which are known in the RulesRegistry",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Querying Rules"
+                ],
+                "summary": "Returns a list of available rules",
+                "operationId": "get-rules",
+                "responses": {}
+            }
+        },
+        "/rules/:rule": {
+            "get": {
+                "security": [
+                    {
+                        "Bearer": []
+                    }
+                ],
+                "description": "Returns two obea an Input Object and an Output Object\ndescribing the Rules stored values and required parameters",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Querying Rules"
+                ],
+                "summary": "Returns details about a rule",
+                "operationId": "get-rule-details",
+                "responses": {
+                    "200": {
+                        "description": "Hostname",
+                        "schema": {
+                            "$ref": "#/definitions/models.SimpleHostnameResponse"
+                        }
+                    }
+                }
+            }
+        },
         "/{category}": {
             "get": {
                 "security": [

docs/swagger.yaml

@@ -212,23 +212,6 @@ paths:
       summary: Update hostname for category "notebook"
       tags:
       - Manipulate existing Hostnames
-  /api/rules:
-    get:
-      consumes:
-      - application/json
-      description: Get a list of all available hostname generation rules.
-      produces:
-      - application/json
-      responses:
-        "200":
-          description: List of available rules with descriptions
-          schema:
-            additionalProperties:
-              type: string
-            type: object
-      summary: List Available Rules
-      tags:
-      - Rules
   /api/server:
     post:
       consumes:
@@ -330,6 +313,36 @@ paths:
       summary: User login
       tags:
       - Authentication
+  /rules:
+    get:
+      description: Return a list of names of Rules which are known in the RulesRegistry
+      operationId: get-rules
+      produces:
+      - application/json
+      responses: {}
+      security:
+      - Bearer: []
+      summary: Returns a list of available rules
+      tags:
+      - Querying Rules
+  /rules/:rule:
+    get:
+      description: |-
+        Returns two obea an Input Object and an Output Object
+        describing the Rules stored values and required parameters
+      operationId: get-rule-details
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: Hostname
+          schema:
+            $ref: '#/definitions/models.SimpleHostnameResponse'
+      security:
+      - Bearer: []
+      summary: Returns details about a rule
+      tags:
+      - Querying Rules
 securityDefinitions:
   Bearer:
     description: Type "Bearer" followed by a space and JWT token.

go.mod

@@ -27,6 +27,7 @@ require (
 	github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/cors v1.5.0
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect

go.sum

@@ -22,6 +22,8 @@ github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumC
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
 github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
+github.com/gin-contrib/cors v1.5.0 h1:DgGKV7DDoOn36DFkNtbHrjoRiT5ExCe+PC9/xp7aKvk=
+github.com/gin-contrib/cors v1.5.0/go.mod h1:TvU7MAZ3EwrPLI2ztzTt3tqgvBCq+wn8WpZmfADjupI=
 github.com/gin-contrib/gzip v0.0.6 h1:NjcunTcGAj5CO1gn4N8jHOSIeRFHIbn51z6K+xaN4d4=
 github.com/gin-contrib/gzip v0.0.6/go.mod h1:QOJlmV2xmayAjkNS2Y8NQsMneuRShOU/kjovCXNuzzk=
 github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=

router/router.go

@@ -19,6 +19,7 @@ import (
 	"git.beisel.it/florian/hostname-service/auth"
 	"git.beisel.it/florian/hostname-service/docs"
 	"git.beisel.it/florian/hostname-service/middleware"
+	"github.com/gin-contrib/cors"
 	"github.com/gin-gonic/gin"
 	swaggerFiles "github.com/swaggo/files"
 	ginSwagger "github.com/swaggo/gin-swagger"
@@ -27,7 +28,14 @@ import (
 
 func New() *gin.Engine {
 	gin.SetMode(gin.DebugMode)
+
 	router := gin.Default()
+	//	// Configure CORS
+	config := cors.DefaultConfig()
+	config.AllowOrigins = []string{"http://localhost:3000", "http://localhost:8080", "*"} // Set to your frontend's URL
+	config.AllowMethods = []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}
+	config.AllowHeaders = []string{"Origin", "Content-Type", "Authorization"}
+	router.Use(cors.New(config))
 
 	docs.SwaggerInfo.Host = "localhost:8080"
 	docs.SwaggerInfo.BasePath = "/api/v1"
@@ -62,7 +70,8 @@ func New() *gin.Engine {
 			authenticated.GET("/:category", api.ListHostnamesByCategory)
 
 			// List available Rules
-			authenticated.GET("/api/rules", api.ListAvailableRules)
+			authenticated.GET("/rules", api.ListAvailableRules)
+			authenticated.GET("/rules/:rule", api.GetRuleStruct)
 		}
 	}
 

rules/interface.go

@@ -1,6 +1,7 @@
 package rules
 
 import (
+	"encoding/json"
 	"fmt"
 	"log"
 
@@ -59,3 +60,11 @@ func (br *BaseRule) baseUpdate(rule HostnameRule, category string, oldhostname s
 
 	return newHostname, nil
 }
+
+func StructToJSON(v interface{}) (string, error) {
+	bytes, err := json.Marshal(v)
+	if err != nil {
+		return "", err
+	}
+	return string(bytes), nil
+}