Add forgot password resolver

Resolves #10

server/resolvers/forgotPassword.go

@@ -0,0 +1,47 @@
+package resolvers
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/yauthdev/yauth/server/db"
+	"github.com/yauthdev/yauth/server/graph/model"
+	"github.com/yauthdev/yauth/server/utils"
+)
+
+func ForgotPassword(ctx context.Context, params model.ForgotPasswordInput) (*model.Response, error) {
+	var res *model.Response
+
+	if params.NewPassword != params.ConfirmPassword {
+		return res, fmt.Errorf(`passwords don't match`)
+	}
+
+	_, err := db.Mgr.GetVerificationByToken(params.Token)
+	if err != nil {
+		return res, fmt.Errorf(`invalid token`)
+	}
+
+	// verify if token exists in db
+	claim, err := utils.VerifyVerificationToken(params.Token)
+	if err != nil {
+		return res, fmt.Errorf(`invalid token`)
+	}
+
+	user, err := db.Mgr.GetUserByEmail(claim.Email)
+	if err != nil {
+		return res, err
+	}
+
+	password, _ := utils.HashPassword(params.NewPassword)
+	user.Password = password
+
+	// delete from verification table
+	db.Mgr.DeleteToken(claim.Email)
+	db.Mgr.UpdateUser(user)
+
+	res = &model.Response{
+		Message: `Password updated successfully.`,
+	}
+
+	return res, nil
+}

server/resolvers/forgotPasswordRequest.go

@@ -0,0 +1,50 @@
+package resolvers
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"strings"
+	"time"
+
+	"github.com/yauthdev/yauth/server/db"
+	"github.com/yauthdev/yauth/server/enum"
+	"github.com/yauthdev/yauth/server/graph/model"
+	"github.com/yauthdev/yauth/server/utils"
+)
+
+func ForgotPasswordRequest(ctx context.Context, params model.ForgotPasswordRequestInput) (*model.Response, error) {
+	var res *model.Response
+	params.Email = strings.ToLower(params.Email)
+
+	if !utils.IsValidEmail(params.Email) {
+		return res, fmt.Errorf("invalid email")
+	}
+
+	_, err := db.Mgr.GetUserByEmail(params.Email)
+	if err != nil {
+		return res, fmt.Errorf(`user with this email not found`)
+	}
+
+	token, err := utils.CreateVerificationToken(params.Email, enum.ForgotPassword.String())
+	if err != nil {
+		log.Println(`Error generating token`, err)
+	}
+	db.Mgr.AddVerification(db.VerificationRequest{
+		Token:      token,
+		Identifier: enum.ForgotPassword.String(),
+		ExpiresAt:  time.Now().Add(time.Minute * 30).Unix(),
+		Email:      params.Email,
+	})
+
+	// exec it as go routin so that we can reduce the api latency
+	go func() {
+		utils.SendForgotPasswordMail(params.Email, token)
+	}()
+
+	res = &model.Response{
+		Message: `Please check your inbox! We have sent a password reset link.`,
+	}
+
+	return res, nil
+}