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[helpers] Support base64url encoding (#13264)

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This commit is contained in:
Keith Burzinski
2026-01-16 02:55:24 -06:00
committed by GitHub
parent 68affe0b9c
commit 5b37d2fb27
1 changed files with 9 additions and 2 deletions
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11
esphome/core/helpers.cpp
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@@ -487,19 +487,26 @@ static constexpr const char *BASE64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
// Helper function to find the index of a base64 character in the lookup table.
// Helper function to find the index of a base64/base64url character in the lookup table.
// Returns the character's position (0-63) if found, or 0 if not found.
// Supports both standard base64 (+/) and base64url (-_) alphabets.
// NOTE: This returns 0 for both 'A' (valid base64 char at index 0) and invalid characters.
// This is safe because is_base64() is ALWAYS checked before calling this function,
// preventing invalid characters from ever reaching here. The base64_decode function
// stops processing at the first invalid character due to the is_base64() check in its
// while loop condition, making this edge case harmless in practice.
static inline uint8_t base64_find_char(char c) {
// Handle base64url variants: '-' maps to '+' (index 62), '_' maps to '/' (index 63)
if (c == '-')
return 62;
if (c == '_')
return 63;
const char *pos = strchr(BASE64_CHARS, c);
return pos ? (pos - BASE64_CHARS) : 0;
}
static inline bool is_base64(char c) { return (isalnum(c) || (c == '+') || (c == '/')); }
// Check if character is valid base64 or base64url
static inline bool is_base64(char c) { return (isalnum(c) || (c == '+') || (c == '/') || (c == '-') || (c == '_')); }
std::string base64_encode(const std::vector<uint8_t> &buf) { return base64_encode(buf.data(), buf.size()); }