feat(api): add basic auth support

pkg/gotenberg/env.go

@@ -0,0 +1,35 @@
+package gotenberg
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+// StringEnv retrieves the value of the environment variable named by the key.
+// If the variable is present in the environment and not empty, the value is
+// returned.
+func StringEnv(key string) (string, error) {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return "", fmt.Errorf("environment variable '%s' does not exist", key)
+	}
+	if val == "" {
+		return "", fmt.Errorf("environment variable '%s' is empty", key)
+	}
+	return val, nil
+}
+
+// IntEnv relies on [StringEnv] and converts the values if it exists and is not
+// empty.
+func IntEnv(key string) (int, error) {
+	val, err := StringEnv(key)
+	if err != nil {
+		return 0, err
+	}
+	intVal, err := strconv.Atoi(val)
+	if err != nil {
+		return 0, fmt.Errorf("get int value of environment variable '%s': %w", key, err)
+	}
+	return intVal, nil
+}

pkg/gotenberg/env_test.go

@@ -0,0 +1,134 @@
+package gotenberg
+
+import (
+	"os"
+	"testing"
+)
+
+func TestStringEnv(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		key         string
+		setEnv      func()
+		expectVal   string
+		expectError bool
+	}{
+		{
+			scenario:    "non-existing environment variable",
+			key:         "NON_EXISTING",
+			expectVal:   "",
+			expectError: true,
+		},
+		{
+			scenario: "empty environment variable",
+			key:      "EMPTY_STRING",
+			setEnv: func() {
+				err := os.Setenv("EMPTY_STRING", "")
+				if err != nil {
+					t.Fatalf("expected no error but got: %v", err)
+				}
+			},
+			expectVal:   "",
+			expectError: true,
+		},
+		{
+			scenario: "success",
+			key:      "EXISTING_STRING_VALUE",
+			setEnv: func() {
+				err := os.Setenv("EXISTING_STRING_VALUE", "foo")
+				if err != nil {
+					t.Fatalf("expected no error but got: %v", err)
+				}
+			},
+			expectVal:   "foo",
+			expectError: false,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			if tc.setEnv != nil {
+				tc.setEnv()
+			}
+
+			val, err := StringEnv(tc.key)
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+
+			if tc.expectVal != val {
+				t.Errorf("expected value '%s' but got '%s'", tc.expectVal, val)
+			}
+		})
+	}
+}
+
+func TestIntEnv(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		key         string
+		setEnv      func()
+		expectVal   int
+		expectError bool
+	}{
+		{
+			scenario: "empty environment variable",
+			key:      "EMPTY_INT",
+			setEnv: func() {
+				err := os.Setenv("EMPTY_INT", "")
+				if err != nil {
+					t.Fatalf("expected no error but got: %v", err)
+				}
+			},
+			expectVal:   0,
+			expectError: true,
+		},
+		{
+			scenario: "non-integer value",
+			key:      "NON_INTEGER",
+			setEnv: func() {
+				err := os.Setenv("NON_INTEGER", "foo")
+				if err != nil {
+					t.Fatalf("expected no error but got: %v", err)
+				}
+			},
+			expectVal:   0,
+			expectError: true,
+		},
+		{
+			scenario: "success",
+			key:      "EXISTING_INT_VALUE",
+			setEnv: func() {
+				err := os.Setenv("EXISTING_INT_VALUE", "123")
+				if err != nil {
+					t.Fatalf("expected no error but got: %v", err)
+				}
+			},
+			expectVal:   123,
+			expectError: false,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			if tc.setEnv != nil {
+				tc.setEnv()
+			}
+
+			val, err := IntEnv(tc.key)
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+
+			if tc.expectVal != val {
+				t.Errorf("expected value %d but got %d", tc.expectVal, val)
+			}
+		})
+	}
+}