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feat: Implement validation for HTTP FormValue(s) in frontend microser… (
GoogleCloudPlatform#2438) * feat: Implement validation for HTTP FormValue(s) in frontend microservice * feat: Implement validation layer in frontend microservice * Reduce loadgenerator "addToCart" quantity values * Update ci-pr.yaml to test Go packages --------- Co-authored-by: Nim Jayawardena <[email protected]> Co-authored-by: Nim Jayawardena <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2024 Google LLC | ||
| // | ||
| // 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. | ||
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| package validator | ||
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| import ( | ||
| "errors" | ||
| "fmt" | ||
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| "github.com/go-playground/validator/v10" | ||
| ) | ||
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| var validate *validator.Validate | ||
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| // init() is a special function that will run when this package is imported. | ||
| // It instantiates a SINGLE instance of *validator.Validate with the added | ||
| // benefit of caching struct info and validations. | ||
| func init() { | ||
| validate = validator.New(validator.WithRequiredStructEnabled()) | ||
| } | ||
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| type Payload interface { | ||
| Validate() error | ||
| } | ||
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| type AddToCartPayload struct { | ||
| Quantity uint64 `validate:"required,gte=1,lte=10"` | ||
| ProductID string `validate:"required"` | ||
| } | ||
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| type PlaceOrderPayload struct { | ||
| Email string `validate:"required,email"` | ||
| StreetAddress string `validate:"required,max=512"` | ||
| ZipCode int64 `validate:"required"` | ||
| City string `validate:"required,max=128"` | ||
| State string `validate:"required,max=128"` | ||
| Country string `validate:"required,max=128"` | ||
| CcNumber string `validate:"required,credit_card"` | ||
| CcMonth int64 `validate:"required,gte=1,lte=12"` | ||
| CcYear int64 `validate:"required"` | ||
| CcCVV int64 `validate:"required"` | ||
| } | ||
|
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| type SetCurrencyPayload struct { | ||
| Currency string `validate:"required,iso4217"` | ||
| } | ||
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| // Implementations of the 'Payload' interface. | ||
| func (ad *AddToCartPayload) Validate() error { | ||
| return validate.Struct(ad) | ||
| } | ||
|
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| func (po *PlaceOrderPayload) Validate() error { | ||
| return validate.Struct(po) | ||
| } | ||
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| func (sc *SetCurrencyPayload) Validate() error { | ||
| return validate.Struct(sc) | ||
| } | ||
|
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| // Reusable error response function. | ||
| func ValidationErrorResponse(err error) error { | ||
| validationErrs, ok := err.(validator.ValidationErrors) | ||
| if !ok { | ||
| return errors.New("invalid validation error format") | ||
| } | ||
| var msg string | ||
| for _, err := range validationErrs { | ||
| msg += fmt.Sprintf("Field '%s' is invalid: %s\n", err.Field(), err.Tag()) | ||
| } | ||
| return fmt.Errorf(msg) | ||
| } |
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