fix: implements logfmt with more strict rules. fixes #3006 (#3007)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

internal/docker/logfmt_test.go

@@ -0,0 +1,82 @@
+package docker
+
+import (
+	"encoding/json"
+	"reflect"
+	"testing"
+
+	orderedmap "github.com/wk8/go-ordered-map/v2"
+)
+
+func TestParseLog(t *testing.T) {
+
+	tests := []struct {
+		name    string
+		log     string
+		want    *orderedmap.OrderedMap[string, string]
+		wantErr bool
+	}{
+		{
+			name: "Valid logfmt log",
+			log:  `time="2024-06-02T14:30:42Z" level=debug msg="container e23e04da2cb9 started"`,
+			want: orderedmap.New[string, string](
+				orderedmap.WithInitialData(
+					orderedmap.Pair[string, string]{Key: "time", Value: "2024-06-02T14:30:42Z"},
+					orderedmap.Pair[string, string]{Key: "level", Value: "debug"},
+					orderedmap.Pair[string, string]{Key: "msg", Value: "container e23e04da2cb9 started"},
+				),
+			),
+			wantErr: false,
+		},
+		{
+			name:    "Random test with equal sign",
+			log:     "foo bar=baz",
+			want:    nil,
+			wantErr: true,
+		},
+		{
+			name:    "Invalid log with key without value",
+			log:     "key1=value1 key2=",
+			want:    nil,
+			wantErr: true,
+		},
+		{
+			name: "Valid log",
+			log:  "key1=value1 key2=value2",
+			want: orderedmap.New[string, string](
+				orderedmap.WithInitialData(
+					orderedmap.Pair[string, string]{Key: "key1", Value: "value1"},
+					orderedmap.Pair[string, string]{Key: "key2", Value: "value2"},
+				),
+			),
+			wantErr: false,
+		},
+		{
+			name:    "Invalid log with unclosed quotes",
+			log:     "key1=\"value1 key2=value2",
+			want:    nil,
+			wantErr: true,
+		},
+		{
+			name:    "Plain text log",
+			log:     "foo bar baz",
+			want:    nil,
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := ParseLogFmt(tt.log)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ParseLogFmt() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				jsonGot, _ := json.MarshalIndent(got, "", "  ")
+				jsonWant, _ := json.MarshalIndent(tt.want, "", "  ")
+				t.Errorf("ParseLogFmt() = %v, want %v", string(jsonGot), string(jsonWant))
+			}
+		})
+	}
+}