initial trelease

eansearch.go

@@ -0,0 +1,112 @@
+package eansearch
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strconv"
+)
+
+// preferred language
+const English uint = 1
+const Danish uint = 2
+const German uint = 3
+const Spanish uint = 4
+const Finish uint = 5
+const French uint = 6
+const Italian uint = 8
+const Dutch uint = 10
+const Norwegian uint = 11
+const Polish uint = 12
+const Portuguese uint = 13
+const Swedish uint = 15
+const AnyLanguage uint = 99
+
+// Product holds datasets returned by the API
+type Product struct {
+	Ean            string
+	Name           string
+	CategoryID     uint `json:",string"`
+	CategoryName   string
+	IssuingCountry string
+}
+
+type productOrError struct {
+	Product
+	Error string
+}
+
+type searchList struct {
+	Page          uint
+	MoreProducts  bool
+	TotalProducts uint
+	ProductList   []Product
+	Error         string
+}
+
+var token string
+
+const baseURL string = "https://api.ean-search.org/api?format=json&token="
+
+// SetToken initialises the API with the token, you can apply for at https://www.ean-search.org/ean-database-api.html
+func SetToken(t string) {
+	token = t
+}
+
+// BarcodeLookup searches for a single EAN code
+func BarcodeLookup(ean string, lang uint) ([]Product, error) {
+	var url string = baseURL + token + "&op=barcode-lookup&ean=" + ean + "&lang=" + fmt.Sprint(lang)
+	res, httperror := http.Get(url)
+	if httperror != nil || res.StatusCode != http.StatusOK {
+		return nil, errors.New("HTTP Error " + strconv.Itoa(res.StatusCode))
+	}
+	defer res.Body.Close()
+	body, _ := ioutil.ReadAll(res.Body)
+
+	var products []productOrError
+	err := json.Unmarshal(body, &products)
+	if err != nil {
+		return nil, err
+	}
+	if len(products) > 0 && products[0].Error == "" {
+		return []Product{products[0].Product}, nil
+	} else if len(products) > 0 {
+		return nil, errors.New(products[0].Error)
+	}
+	return nil, errors.New("No response from API")
+}
+
+func callAPIList(op string, page uint, lang uint) ([]Product, bool, error) {
+	var url string = baseURL + token + op + "&page=" + fmt.Sprint(page) + "&lang=" + fmt.Sprint(lang)
+	res, httperror := http.Get(url)
+	if httperror != nil || res.StatusCode != http.StatusOK {
+		return nil, false, errors.New("HTTP Error " + strconv.Itoa(res.StatusCode))
+	}
+	defer res.Body.Close()
+	body, _ := ioutil.ReadAll(res.Body)
+
+	var list searchList
+	err := json.Unmarshal(body, &list)
+	if err != nil {
+		return nil, false, err
+	}
+	if len(list.ProductList) > 0 && list.Error == "" {
+		return list.ProductList, list.MoreProducts, nil
+	} else if len(list.ProductList) > 0 {
+		return nil, false, errors.New(list.Error)
+	}
+	return nil, false, errors.New("No response from API")
+}
+
+// BarcodePrefixSearch find all EANs strating with a certain prefix
+func BarcodePrefixSearch(prefix string, page uint, lang uint) ([]Product, bool, error) {
+	return callAPIList("&op=barcode-prefix-search&prefix="+prefix, page, lang)
+}
+
+// ProductSearch searches for products by name
+func ProductSearch(name string, page uint, lang uint) ([]Product, bool, error) {
+	return callAPIList("&op=product-search&name="+url.QueryEscape(name), page, lang)
+}

go.mod

@@ -0,0 +1,3 @@
+module github.com/eansearch/go-ean-search
+
+go 1.13