94 lines
3.5 KiB
Go
94 lines
3.5 KiB
Go
package main
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import (
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"fmt"
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"greenlight.craftr.fr/internal/data"
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"greenlight.craftr.fr/internal/validator"
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"net/http"
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"time"
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)
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// "POST /v1/movies" endpoint.
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func (app *application) createMovieHandler(w http.ResponseWriter, r *http.Request) {
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// Declare an anonymous struct to hold the information that we expect to be in the HTTP request body (note that the field names and types in the struct are a subset of the Movie struct that we created earlier). This struct will be our *target decode destination*.
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var input struct {
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Title string `json:"title"`
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Year int32 `json:"year"`
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Runtime data.Runtime `json:"runtime"`
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Genres []string `json:"genres"`
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}
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// Use the new readJSON() helper to decode the request body into the input struct. If this returns an error, we send the client the error message along with a 400 Bad Request status code, just like before.
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err := app.readJSON(w, r, &input)
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if err != nil {
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app.badRequestResponse(w, r, err)
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return
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}
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// Copy the values from the input struct to a new Movie struct : we're doing this because a client could provide the keys *id* and *version* in their JSON request, and the corresponding values would be decoded without any error into the *ID* and *Version* fields of the *Movie* struct - even though we don't want them to be.
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movie := &data.Movie{
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Title: input.Title,
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Year: input.Year,
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Runtime: input.Runtime,
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Genres: input.Genres,
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}
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// Initialize a new Validator instance
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v := validator.New()
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// Call the ValidateMovie() function and return a response containing the errors if any of the checks fail.
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if data.ValidateMovie(v, movie); !v.Valid() {
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app.failedValidationResponse(w, r, v.Errors)
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return
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}
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// Call the Insert() method on our movies model, passing in a pointer to the validated struct. This will create a record in the database and update the movie struct with the system-generated information
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err = app.models.Movies.Insert(movie)
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if err != nil {
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app.serverErrorResponse(w, r, err)
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return
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}
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// When sending a HTTP response, we want to include a location header to let the client know which URL they can find the newly-created resource at. We make an empty http.Header map and then use the Set() method to add a new location header, interpolating the system-generated ID for our new movie in the URL.
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headers := make(http.Header)
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headers.Set("Location", fmt.Sprintf("/v1/movies/%d", movie.ID))
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// Write a JSON response with a 201 Created status code, the movie data in the response body, and the Location header
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err = app.writeJSON(w, http.StatusCreated, envelope{"movie": movie}, headers)
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if err != nil {
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app.serverErrorResponse(w, r, err)
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}
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}
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// "GET /v1/movies/:id"
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func (app *application) showMovieHandler(w http.ResponseWriter, r *http.Request) {
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id, err := app.readIDParam(r)
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if err != nil || id < 1 {
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// Use the new notFoundResponse() helper
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app.notFoundResponse(w, r)
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return
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}
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/*
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Create a new instance of the Movie struct containing the ID we
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extracted from the URL and some dummy data. Also notice that we
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deliberately haven't set a value for the Year field.
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*/
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movie := data.Movie{
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ID: id,
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CreatedAt: time.Now(),
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Title: "Casablanca",
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Runtime: 102,
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Genres: []string{"drama", "romance", "war"},
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Version: 1,
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}
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// Encode the struct to JSON and send it as the HTTP response.
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err = app.writeJSON(w, http.StatusOK, envelope{"movie": movie}, nil)
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if err != nil {
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// Use the new serverErrorResponse() helper
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app.serverErrorResponse(w, r, err)
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}
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}
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