feat: transform Freshers-Hub into installable Progressive Web App (PWA) with offline caching

generate_pwa_icons.py

@@ -0,0 +1,112 @@
+import zlib
+import struct
+import math
+
+def make_png(width, height, draw_func):
+    # PNG signature
+    png = bytearray(b'\x89PNG\r\n\x1a\n')
+    
+    # IHDR chunk
+    ihdr_data = struct.pack('!IIBBBBB', width, height, 8, 6, 0, 0, 0)
+    ihdr_crc = zlib.crc32(b'IHDR' + ihdr_data)
+    png.extend(struct.pack('!I', len(ihdr_data)))
+    png.extend(b'IHDR')
+    png.extend(ihdr_data)
+    png.extend(struct.pack('!I', ihdr_crc))
+    
+    # IDAT chunk
+    raw_data = bytearray()
+    for y in range(height):
+        raw_data.append(0)  # Filter type 0 (None)
+        for x in range(width):
+            r, g, b, a = draw_func(x, y, width, height)
+            raw_data.extend([r, g, b, a])
+            
+    compressed = zlib.compress(raw_data, 9)
+    idat_crc = zlib.crc32(b'IDAT' + compressed)
+    png.extend(struct.pack('!I', len(compressed)))
+    png.extend(b'IDAT')
+    png.extend(compressed)
+    png.extend(struct.pack('!I', idat_crc))
+    
+    # IEND chunk
+    iend_crc = zlib.crc32(b'IEND')
+    png.extend(struct.pack('!I', 0))
+    png.extend(b'IEND')
+    png.extend(struct.pack('!I', iend_crc))
+    
+    return bytes(png)
+
+def icon_drawer(x, y, w, h):
+    # Orange gradient background (#F97316 to #EA580C)
+    t = y / h
+    r_bg = int(249 * (1 - t) + 234 * t)
+    g_bg = int(115 * (1 - t) + 88 * t)
+    b_bg = int(22 * (1 - t) + 12 * t)
+    
+    cx, cy = w / 2, h / 2
+    dx = x - cx
+    dy = y - cy
+    dist = math.sqrt(dx*dx + dy*dy)
+    
+    # Outer rounded rectangle mask
+    corner_radius = w * 0.22
+    in_box = True
+    if abs(dx) > (w/2 - corner_radius) and abs(dy) > (h/2 - corner_radius):
+        cdx = abs(dx) - (w/2 - corner_radius)
+        cdy = abs(dy) - (h/2 - corner_radius)
+        if cdx*cdx + cdy*cdy > corner_radius*corner_radius:
+            in_box = False
+            
+    if not in_box:
+        return 0, 0, 0, 0
+        
+    # Draw White Cap / Rocket 'R' symbol in center
+    # Top diamond (Cap)
+    cap_y = cy - h * 0.1
+    if abs(dy + h*0.08) < h*0.18 and abs(dx) < (h*0.18 - abs(dy + h*0.08))*1.8:
+        return 255, 255, 255, 255
+        
+    # Cap base pillar
+    if abs(dx) < w*0.08 and cy < y < cy + h*0.18:
+        return 255, 255, 255, 255
+        
+    # Cap tassel line
+    if w*0.18 < dx < w*0.25 and cy - h*0.05 < y < cy + h*0.12:
+        return 255, 255, 255, 255
+        
+    return r_bg, g_bg, b_bg, 255
+
+def maskable_drawer(x, y, w, h):
+    # Full bleed background for maskable icon
+    t = y / h
+    r_bg = int(249 * (1 - t) + 234 * t)
+    g_bg = int(115 * (1 - t) + 88 * t)
+    b_bg = int(22 * (1 - t) + 12 * t)
+    
+    cx, cy = w / 2, h / 2
+    dx = x - cx
+    dy = y - cy
+    
+    # Draw White Cap in center (slightly scaled inside safe zone)
+    if abs(dy + h*0.06) < h*0.14 and abs(dx) < (h*0.14 - abs(dy + h*0.06))*1.6:
+        return 255, 255, 255, 255
+        
+    if abs(dx) < w*0.06 and cy < y < cy + h*0.14:
+        return 255, 255, 255, 255
+        
+    return r_bg, g_bg, b_bg, 255
+
+with open('public/pwa-192x192.png', 'wb') as f:
+    f.write(make_png(192, 192, icon_drawer))
+
+with open('public/pwa-512x512.png', 'wb') as f:
+    f.write(make_png(512, 512, icon_drawer))
+
+with open('public/apple-touch-icon.png', 'wb') as f:
+    f.write(make_png(180, 180, icon_drawer))
+
+with open('public/pwa-maskable-512x512.png', 'wb') as f:
+    f.write(make_png(512, 512, maskable_drawer))
+
+print("PWA icons generated successfully!")