[INIT]: initial Commit

Author: AIRONAX-Developer

.gitignore

@@ -0,0 +1,86 @@
+# File created using '.gitignore Generator' for Visual Studio Code: https://bit.ly/vscode-gig
+# Created by https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,go
+# Edit at https://www.toptal.com/developers/gitignore?templates=windows,visualstudiocode,go
+
+### Go ###
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+### Go Patch ###
+/vendor/
+/Godeps/
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+# Support for Project snippet scope
+.vscode/*.code-snippets
+
+# Ignore code-workspaces
+*.code-workspace
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,go
+
+# Custom rules (everything added below won't be overriden by 'Generate .gitignore File' if you use 'Update' option)
+

README.md

@@ -0,0 +1,22 @@
+# __go-gin-rest-api__
+
+Golang gin framework REST API with JWT authentication
+
+__URL Endpoints:__
+
+``http://localhost:8080``
+
+| Endpoint  | Method |
+| ------------- | ------------- |
+| ``/[email protected]&password=test``  | __POST__  |
+| ``/emi``  | __POST__ |
+
+## Follow the steps to Run App
+
+    go mod init github.com/AIRONAX-Developer/go-gin-rest-api
+    
+    go mod tidy
+    
+    go mod vendor
+    
+    go mod run main.go

go.mod

@@ -0,0 +1,29 @@
+module github.com/AIRONAX-Developer/go-gin-rest-api
+
+go 1.19
+
+require (
+	github.com/gin-gonic/gin v1.8.1
+	github.com/golang-jwt/jwt/v4 v4.4.2
+)
+
+require (
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.0 // indirect
+	github.com/go-playground/universal-translator v0.18.0 // indirect
+	github.com/go-playground/validator/v10 v10.10.0 // indirect
+	github.com/goccy/go-json v0.9.7 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/leodido/go-urn v1.2.1 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.1 // indirect
+	github.com/ugorji/go/codec v1.2.7 // indirect
+	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
+	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
+	golang.org/x/sys v0.0.0-20210806184541-e5e7981a1069 // indirect
+	golang.org/x/text v0.3.6 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

go.sum

@@ -0,0 +1,88 @@
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+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"fmt"
+	controller "github.com/AIRONAX-Developer/go-gin-rest-api/src/controller"
+	service "github.com/AIRONAX-Developer/go-gin-rest-api/src/service"
+	"math"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	var loginService service.LoginService = service.StaticLoginService()
+	var jwtService service.JWTService = service.JWTAuthService()
+	var loginController controller.LoginController = controller.LoginHandler(loginService, jwtService)
+
+	server := gin.New()
+
+	fmt.Println("loginService ==>> ", loginService)
+	fmt.Println("jwtService ==>> ", jwtService)
+	fmt.Println("loginController ==>> ", loginController)
+
+	server.POST("/login", func(ctx *gin.Context) {
+		token := loginController.Login(ctx)
+		fmt.Println("token ==>> ", token)
+		if token != "" {
+			ctx.JSON(http.StatusOK, gin.H{
+				"token": token,
+			})
+		} else {
+			ctx.JSON(http.StatusUnauthorized, nil)
+		}
+	})
+
+	server.POST("/emi", func(ctx *gin.Context) {
+		// EMI Calculation Formula
+		/*
+			E is EMI
+
+			P is Principal Loan Amount
+
+			r is rate of interest calculated on monthly basis. (i.e., r = Rate of Annual interest/12/100. If rate of interest is 10.5% per annum, then r = 10.5/12/100=0.00875)
+
+			n is loan term / tenure / duration in number of months
+
+			E = P*r* (1+r)^n/(((1+r)^n)-1)
+		*/
+		P := 1000000
+		r := 10.5 / 12 / 100
+		n := 120
+
+		numerator := math.Pow((1 + r), float64(n))
+		denominator := (math.Pow((1+r), float64(n)) - 1)
+
+		Emi := int(math.Round(float64(P) * r * numerator / denominator))
+
+		ctx.JSON(http.StatusOK, gin.H{
+			"Principal":     P,
+			"InterestRate":  r,
+			"Tenure":        n,
+			"Emi":           Emi,
+			"TotalEmi":      (Emi * n),
+			"TotalInterest": ((Emi * n) - P),
+		})
+	})
+
+	port := "8080"
+	server.Run(":" + port)
+}

src/LoCred/LoginCredentials.go

@@ -0,0 +1,6 @@
+package LoCred
+
+type LoginCredentialsStruct struct {
+	Email    string `form:"email"`
+	Password string `form:"password"`
+}

src/controller/LoginController.go

@@ -0,0 +1,40 @@
+package controller
+
+import (
+	"fmt"
+	locred "github.com/AIRONAX-Developer/go-gin-rest-api/src/LoCred"
+	service "github.com/AIRONAX-Developer/go-gin-rest-api/src/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+type LoginController interface {
+	Login(ctx *gin.Context) string
+}
+
+type LoginControllerStruct struct {
+	loginService service.LoginService
+	jwtService   service.JWTService
+}
+
+func LoginHandler(loginService service.LoginService, jwtService service.JWTService) LoginController {
+	return &LoginControllerStruct{
+		loginService: loginService,
+		jwtService:   jwtService,
+	}
+}
+
+func (controller *LoginControllerStruct) Login(ctx *gin.Context) string {
+	var credentials locred.LoginCredentialsStruct
+	err := ctx.ShouldBind(&credentials)
+	if err != nil {
+		fmt.Println("ctx.ShouldBind ==>> ", err)
+		return err.Error()
+	}
+
+	isUserAuthenticated := controller.loginService.LoginUser(credentials.Email, credentials.Password)
+	if isUserAuthenticated {
+		return controller.jwtService.GenerateToken(credentials.Email, true)
+	}
+	return ""
+}

src/middleware/JWTMiddleware.go

@@ -0,0 +1,28 @@
+package middleware
+
+import (
+	"fmt"
+	service "github.com/AIRONAX-Developer/go-gin-rest-api/src/service"
+	"net/http"
+
+	"github.com/golang-jwt/jwt/v4"
+	"github.com/gin-gonic/gin"
+)
+
+func AuthorizeJWT() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		const BEARER_SCHEMA = "Bearer"
+		authHeader := c.GetHeader("Authorization")
+		tokenString := authHeader[len(BEARER_SCHEMA):]
+		// token, err := service.JWTAuthService().ValidateToken(tokenString)
+		token, err := service.JWTAuthService().ValidateToken(tokenString)
+		if token.Valid {
+			claims := token.Claims.(jwt.MapClaims)
+			fmt.Println(claims)
+		} else {
+			fmt.Println(err)
+			c.AbortWithStatus(http.StatusUnauthorized)
+		}
+
+	}
+}