add param abstraction to request context

server/ctrlsubsonic/params/params.go

@@ -0,0 +1,57 @@
+package params
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"strconv"
+)
+
+type Params struct {
+	values url.Values
+}
+
+func New(r *http.Request) Params {
+	// first load params from the url
+	params := r.URL.Query()
+	// also if there's any in the post body, use those too
+	if err := r.ParseForm(); err != nil {
+		return Params{params}
+	}
+	for k, v := range r.Form {
+		params[k] = v
+	}
+	return Params{params}
+}
+
+func (p Params) Get(key string) string {
+	return p.values.Get(key)
+}
+
+func (p Params) GetOr(key, or string) string {
+	val := p.Get(key)
+	if val == "" {
+		return or
+	}
+	return val
+}
+
+func (p Params) GetInt(key string) (int, error) {
+	strVal := p.values.Get(key)
+	if strVal == "" {
+		return 0, fmt.Errorf("no param with key `%s`", key)
+	}
+	val, err := strconv.Atoi(strVal)
+	if err != nil {
+		return 0, fmt.Errorf("not an int `%s`", strVal)
+	}
+	return val, nil
+}
+
+func (p Params) GetIntOr(key string, or int) int {
+	val, err := p.GetInt(key)
+	if err != nil {
+		return or
+	}
+	return val
+}