Add add config validators

src/configloader/ListParsers.go

@@ -0,0 +1,62 @@
+package configloader
+
+import _ "embed"
+
+import (
+    "encoding/json"
+    "errors"
+    "slices"
+)
+
+type ParserListItem struct {
+    Title string `json:"title"`
+    Comment string `json:"comment"`
+    Authors []string `json:"authors"`
+    Links []string  `json:"links"`
+}
+
+// Load parser list from JSON retrieved from musdb's API
+// See https://<subdomain>.museum-digital.org/musdb/api/meta/list_import_parsers
+// The embed module requires the variable to not be bound to a function.
+
+//go:embed parser_list.json
+var rawParserList []byte
+
+// Returns a list of the available parsers.
+func ListParsers() []ParserListItem {
+
+    parserListFromApi := []ParserListItem{}
+    // parserListFromApi := new(ApiParserListFormat)
+    json.Unmarshal(rawParserList, &parserListFromApi)
+    print(parserListFromApi)
+
+    return parserListFromApi
+
+}
+
+// Checks if inputParser is in the list of available parsers.
+// Returns the parser name or an error.
+func ValidateParser(inputParser string) (string, error) {
+
+    parserList := ListParsers()
+    parserTitles := []string{}
+
+    for _, p := range(parserList) {
+        parserTitles = append(parserTitles, p.Title)
+    }
+
+    if slices.Contains(parserTitles, inputParser) {
+        return inputParser, nil
+    }
+
+    // Accepted invalid modes to clean up:
+    // ParserLido > Lido
+    // lido > Lido
+    cleaned := inputParser[6:]
+    if slices.Contains(parserTitles, cleaned) {
+        return cleaned, nil
+    }
+
+    return "", errors.New("Invalid parser selected")
+
+}