Add next_url to improv serial component config (#4343)

esphome/components/improv_base/__init__.py

@@ -0,0 +1,42 @@
+import re
+
+import esphome.config_validation as cv
+import esphome.codegen as cg
+
+from esphome.const import __version__
+
+CODEOWNERS = ["@esphome/core"]
+
+CONF_NEXT_URL = "next_url"
+
+VALID_SUBSTITUTIONS = ["esphome_version", "ip_address", "device_name"]
+
+
+def validate_next_url(value):
+    value = cv.url(value)
+    test = r"{{(?!" + r"\b|".join(VALID_SUBSTITUTIONS) + r"\b)(\w+)}}"
+    result = re.search(test, value)
+    if result:
+        raise cv.Invalid(
+            f"Invalid substitution(s) ({', '.join(result.groups())}) in next_url. Valid substitutions are: {', '.join(VALID_SUBSTITUTIONS)}"
+        )
+    return value
+
+
+IMPROV_SCHEMA = cv.Schema(
+    {
+        cv.Optional(CONF_NEXT_URL): validate_next_url,
+    }
+)
+
+
+def _process_next_url(url: str):
+    if "{{esphome_version}}" in url:
+        url = url.replace("{{esphome_version}}", __version__)
+    return url
+
+
+async def setup_improv_core(var, config):
+    if CONF_NEXT_URL in config:
+        cg.add(var.set_next_url(_process_next_url(config[CONF_NEXT_URL])))
+    cg.add_library("esphome/Improv", "1.2.3")