species.go

package assignment1

import (
	"encoding/json"
	"net/http"
	"strings"
)

// sends a request to the api and decodes the response into the species struct
func speciesRequest(w http.ResponseWriter, url string, c *http.Client, species *Species) {

	// sends a request to the api and gets a response
	resp := doRequest(w, url, c)

	// decodes the response into the struct
	err := json.NewDecoder(resp.Body).Decode(&species)
	if err != nil {
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		panic(err)
	}

	// closes the body
	defer resp.Body.Close()
}

// sends a request to the api and decodes the response into the year struct
func yearRequest(w http.ResponseWriter, url string, c *http.Client, species *Species) {

	// sends a request to the api and gets a response
	resp := doRequest(w, url, c)

	// empty year struct
	year := &Year{}

	// decodes the response into the struct
	err := json.NewDecoder(resp.Body).Decode(&year)
	if err != nil {
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		panic(err)
	}

	// puts the year from the year struct into the species struct
	species.Year = year.Year

	// closes the body
	defer resp.Body.Close()
}

// HandlerSpecies function: handles the species endpoint
func HandlerSpecies(w http.ResponseWriter, r *http.Request) {

	http.Header.Add(w.Header(), "content-type", "application/json")

	// empty struct that will eventually contain the species values
	species := &Species{}

	APIURL := "http://api.gbif.org/v1/species/"

	// splits the url so we can append user input to the apiurl
	parts := strings.Split(r.URL.Path, "/")

	// checks if it is a valid path
	if len(parts) != 5 || parts[1] != "conservation" || parts[2] != "v1" || parts[3] != "species" || parts[4] == "" {
		status := http.StatusBadRequest
		http.Error(w, "Expecting format /conservation/v1/species/'speciesNumber'", status)
		return
	}

	// Appends userinput to the apiurl
	APIURL += parts[4]
	APIURL2 := APIURL + "/name"

	// makes a client
	client := http.DefaultClient

	// sends requests to the apis, and decodes everything
	speciesRequest(w, APIURL, client, species)
	yearRequest(w, APIURL2, client, species)

	// encodes species which now contains year as well
	err := json.NewEncoder(w).Encode(species)
	if err != nil {
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		panic(err)
	}
}